There are three kinds bioses that I know of, US (1001), Japanese (1000), and European (PAL-7502). These are, generally, interchangable and should run most games equally well. For instance, I use the 7502 (European PAL) bios almost exclusively to run my US NTSC games and it works fine. Just because you use a European bios for a European version of a game, does not mean that the game will work. Some games MUST be patched, no matter what version of the bios you use. Depending on the Itialian PAL game you are trying to run, it may or may not need to be patched.
sincerely,
sx/amiga