I think there are many more changes to short names that need to be corrected in the MARP database. Sets don't magically change region. No XORs for the Euro version of mvsc, therefore, it doesn't work anyway. So all those inps under mvsc should be moved to the correct working version (mvscu).
Which also means that pat33999 doesn't really have the free first that he probably thinks he has.
Add to this:
X-Men vs. Street Fighter (US 960910)
xmvsf -> xmvsfr1
These should be damn obvious as the revision date is not only in the MAME long name, as well as shown when the game boots. You'll also find that xmvsf doesn't work, so it must have moved.