The F-22A RCS changes depending on the database entry (version DB3000 v486):
1) Entry numbers (#): 333, 1085, 2013, 4858, 3821, 4875
2) Entry numbers (#): 2201, 4972
In a separate point, entry #1085 (F-22A Raptor -- United States (Air Force), 2008, Blk 35, AN/APG-77(V)1) possesses only the older, less capable version AN/APG-77 - not the (V)1 claimed by the database entry name.
FYI The RCS issue is more a internal database viewer display issue having to do with the last loadout used for calculating what's displayed (the db rcs values are actually the same for all instances in the db itself) http://www.matrixgames.com/forums/fb.asp?m=4810105 for more detail on what's going on there.
Thanks for replying. I read the thread you linked, that makes sense. All the database entries have the same 'base' RCS. Perhaps an idea in the future is for each loadout to list the RCS beside it?