I get messages to update.
So I activate that and a window labeled Creative Cloud Opens.
Then it gives me a choice of updating
Lightroom Classic CC
Classic CC (2015)
So I update one or two of those. Then a few weeks later I get another update reminder. So I repeat this procedure and it tells me I need to update a couple more of these.
I don't even know which version I have. I pay a monthly fee, and I expect to get the latest version. I don't know if I'm cycling between versions or what is going on. My catalog is so screwed up and LR is running so slow, my workflow is at an almost complete standstill as it is; and on top of that I am getting update reminders for multiple versions of the program.
They are two different programs.
The new Lightroom CC is a completely new application and this will upload, to storage in the Adobe Creative Cloud, the full resolution photo files raw and rendered files that you decide to import. It is a completely new application, it is version 1.0, and does not have all the features that were available in Lightroom CC 2015.
The upgrade from the previous version is now called Lightroom Classic CC its version 7.0.1.
Have a look at the article at the link below.
You can get additional info at this link about all that has taken place over the past few weeks.
I just read an answer to a similar question and found out the main difference as you described.
In the meantime, I seem to have gotten both versions now, whereas before I only had one.
I wish to edit my photos so apparently, Classic CC is the one I mainly need to be using.