Yeah - Ganados could not be shot to $#!t like in the US version(
with the rapid fire weapons) and the handgun seemed to loser the ability to *PoP!* their heads off....Also, the "blood puff" that comes out when you kill a ganado with a dynamite stick as he lights it was changed in tone to look like a smoke cloud...and some other stuff.
The US RE4 GC had all that, though.
I'm guessing RE4 Wii will be a straight port of the compiled PS2/GC version.