Layers structure:
Each of these Smart Objects has it's own LayerComps with names similar to the layer name:
I need to switch on each of the Smart Objects in the LayerSet "Element" one by one and apply the specified LayerComp at the same time. E.g. "Element Red" got "Red" LayerComp applied, "Element Yellow" - "Yellow", etc.
What I have for now.
I've modified a bit Michael L Halecode posted here to switch layers one by one. It's all looks like that:
var DBG = 1;
var id = getSelectedLayerID();
var name = getLayerNameByID(id);
var variations = ["Red", "Yellow", "Green", "Blue"];
if(DBG) {alert("id="+id+"; name="+name); };
for( i=0; i<variations.length; i++ ) {
layerName = name+" "+variations;
showSetByOne( layerName, name );
if(DBG) {alert(layerName)};
}
function showSetByOne( layerName, groupName ){
var setFolder = app.activeDocument.activeLayer;
if (setFolder.typename == 'LayerSet' && setFolder.name == groupName ) {
for( var setIndex = 0; setIndex<setFolder.layers.length; setIndex++) {
if(setFolder.layers[setIndex].name == layerName){
setFolder.layers[setIndex].visible = true;
switchPlacedLayerComp(setFolder.layers[setIndex].id, 1402355601); //exact ID of one of the LayerComps got from ScriptListener
}else{
setFolder.layers[setIndex].visible = false;
}
}
}
}
function switchPlacedLayerComp(id, compID) {
// (ref = new ActionReference()).putEnumerated(sTT('layer'), sTT('ordinal'), sTT('targetEnum'));
(ref = new ActionReference()).putIdentifier( sTT("layer"), id );
// (ref = new ActionReference()).putIndex( sTT("layer"), id );
(desc = new ActionDescriptor()).putReference( sTT("null"), ref );
// alert("Inside Func: "+id);
desc.putInteger( sTT("compID"), compID );
// desc.putString( sTT("comp"), "Red" );
executeAction( sTT("setPlacedLayerComp"), desc, DialogModes.NO );
}
But I can not find any way to process the Smart Objects Layer Comps applying. If to select the exact SO layer and use the exact "compID" ( 1402355601) that was got from Script Listener then LayerComp applies to. But I have only LayerComps names but not IDs. And I could not apply LayerComp to SmartObject without selecting it. Neither by SmarObject id nor by name.
Kukurykus it seems I could not solve this puzzle without your help 
Thanks to all for help in advance! 
1 Correct answer
At the bottom you find script that should work. As you understand I can not test it as following part was not yet part of CS6:
(ref2 = new ActionReference()).putEnumerated(sTT('layer'),
sTT('ordinal'), sTT('targetEnum')); (dsc3 = new ActionDescriptor())
.putReference(sTT('null'), ref2), dsc3.putInteger(sTT('compID'), compID)
executeAction(sTT('setPlacedLayerComp'), dsc3, DialogModes.NO)
Anyway to see that works - for both files you sent - I alerted compID instead of above code nested in script you fi
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There should not be difference using semicolons / commas in this kind of construction. I always do so and never met error. So I'm surprised you had to change commas to semicolons in this case. Most importatnt is that works with new delimiters.
You asked for script that works with layer names schemas like 'Element Red' and 'Red' for Layer Comp. So this is obvious when you change name of Smart Object to 'Red with spaces', and even go further and change name of comp to 'Red with spaces' as well then script won't work. How that has to recognise that name if you wanted they were precised to 'Element Red' for layers and 'Red' for comps? You must decide what you want, because now I see you forgot what you came with Non english characters do not work because you wanted english names for colours, at least you did not mention anything they can appear with other characters. I can't help with linked layers as I don't use CC and you said it's something new. As far as I have CS6 still I can only help with things I can use myself, or like in case of this script they are some way available.
For now I did everyting you wanted in original post. You got script there wasn't available for many years on this forum and nowhere, while coders could do nothing like it (I do have no idea why?) to write themselves something like it but begging Adobe to do it for them. And before some plugin was not released they could not make some time to wrtie similar script 😕
As to cyrylic letters it's possible to do but needs extra work as they are not written in binaries as regular letters you can see.
If I used: /[\wАаБбВвГгДдЕеЁёЖжЗзИиЙйКкЛлМмНнОоПпРрСсТтУуФфХхЦцЧчШшЩщЪъЫыЬьЭэЮюЯя]+$/
that was not be still enough as first I had to change every such encoded letter from binaries to that they are used in real life.
More about original regex I wrote in previous post that was later edited by me, so I'm not sure you saw its whole content
I've changed that part of code to comma and it still works. Maybe I missed something as I totally do not understand such kind of constructions you've used E.g. I absolutely do not understand why there should be comma but not semicolon. 
Yes IT WORKS! It's absolutely amazing and I'm very appreciated to you!
And I did not forget what I came with. When I wrote this topic I had no hope that anybody helps me with that So just not to frighten anyone I've put a simple example of layer names (Name+LayerCompName). I did not keep in mind that that there could be an issue with spaces
And yes! You did impossible! Nobody was able to do this but Kukurykus was! You're a genius!
Forget about cyrillic. It's not such important.
Linked Objects is still an issue. It's a pity you're not able to help with them. I'll try to play with that function I've found but do not think I'll be able to get it work.
Updated
Yes, there is no problem with spaces at all!! All layercomps are always one single word. But if to use them with spaces how the regexp should be changed to fit them? E.g. if to use @ as a separator between layer name and layercomp name?
That doesn't give preview I can have for example in PHP forums. So see how text will be looking after I submit it.
Btw, there was good time (nearly 2 months) that I was taken off from moderation and my posts were accepted without checking. Maybe just do it again
Kukurykus, ha, I looked through your code once more and see that you've already able to get both layer comp name and compID from binary file. Still I can not adopt the script to get these pairs to use them with my switchPlacedLayerComp() function.
And one more issue is that if the Layer Comp name has spaces inside or even has non latin symbols it's became stripped somehow or does not appears at all.
Yes you are right I did not mean edit, just switch, only wrote so All layers were renamed to colour names? That shouldn't happen. Ps informed me when I were opening your both files that their data is specific as they were created in later version, fortunately I could use them, but my script did not work with them completely as not any last layer comp item was selected inside smart object, so in binaries (when I did that and saved files it worked). That is no problem as you still needed script to be modified. Maybe now newest version of script will work however objects are embed or linked - as it only looks for layer comp name and id pairs to apply compID value. You had to give me some examples of those no latin and space characters.
EDIT:
I changed in the script:
var m = r.match(/Nm TEXT.{4}.*?.{6}compIDlong.{4}/g)
to:
var m = r.match(/Nm TEXT.{4}.{0,20}.{6}compIDlong.{4}/g)
so now script is going to work 80 times faster! The only limitation is that colours you use can't be longer than 10 characters (each letter in binaries in that part is preceded by \x00 so it's why I put there 20 (as it's 2 * 10 characters). If you have longer names then that value should be increased to bigger. And then I changed that again doing it mathematically that each time program knows the upper limit of colour characters. It won't speed up script over 80 times, be make it's always more exact.
length = nme[0].length * 2, reg = 'Nm TEXT.{4}.{0,' + length
+ '}.{6}compIDlong.{4}'; var m = r.match(RegExp(reg, 'g'))
A problem with non latin and space character is that I adapted script to your example. I assumed there's always something like 'Element Red' name, so 2 words where first is always the same, then we have space and then single word colour name, where first letter is uppercase. To match it I used dsc1.getString(sTT('name')).match(/\w+$/) where \w+ is for letters/digits/_ and $ marks end of line. If you have other patterns just show them - as there is way to write more complex regex matching wider range of cases still without matching too many characters. Just test everything and tell me what else can be changed.
Would be really cool that worked. I can't check it with CS6 of course but if Jarda Bereza said there's needed plugin then I believe there is or you have to play with binaries I read today there was bug with smartObjectMore, but maybe not anymore and now it will be working
I've add some more stuff to Kukurykus code and now it can understand linked smart objects as well. And as it usually happens after all the work was done and script tested r-binwrote his post with a more simple solution that uses standart functions. And even understands cyrillic! LOL
Thanks a lot to all! But especially to Kukurykus who found not standart but still perfect solution.
Guys you're awesome!
What code you used that worked with linked smart objects? Share it, let everyone have this knowledge as it seems to be very useful stuff for many people, even those who don't know it yet
What about my post that has number 14 on in this theard. Can you after all explain to me what was problem with spaces I asked there about and give some examples, however I understand this problem is gone now, right?
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