If your using a Super Nintedno or Super Famicom and the North American version on the game, the codes will work perfectly or should. This is because the codes were based on the North American version(someone figured it out for the NA games), but if your playing the PAL version (Euorpean) or the Japanese version, the codes may not work because they could be different for that version. ITs mixing two things that shouldn't be mixed lets say.

SNES/Super Famicom + North American game + Codes = Works
SNES/Super Famicom + PAL or Japanese Game + codes = chance codes will not work

That is pretty much all you need to know.So you can use a SNES, but importing a game from Over seas may not work with your codes. So if you get the PAL or Japanese version, just get the codes for those versions.

~ KAMAHAME---Oh shit it's happening again.... ~