No it isn't. Files on a CD do not have an order. The order that they appear in depends upon how you look at the CD. Commonly files are viewed in filename order, but it could be date, type or a whole lot of other parameters.
I assume you have made a collection in PSA SE. Right?
That being the case, you could rename the files before burning. [Click the collection, select all (CTRL/A) and do File/Rename.]