Perhaps I haven't listened to the scores enough on headphones, me thinks! :)

What I was referring to was when the Imperial March transitions to the cue taken from the RSO CD Imperial March track during the credits sequence. To me, it was a noticeable transition. After comparing the two now (your edit and the finale on the SE set) what stands out to me is the fact that the original cue (from the SE soundtrack) lacks snare drums in the background starting around 3:51, while your edit from the Imperial March standalone track does have snares.

I've listened to this credits sequence about a million times over the years (it is, after all, the best medley in the series!), so I guess that's why it just seemed off.

Still, I can't wait for this release!