Hmm, I wonder why they aren't working for me thenI'm not particularly sure that regions can have anything to do with a code's compatibility, then again I can be wrong. But I'm 80/20 that the codes can work with any region.
This question isn't specifically for you Casis, but would anyone from the U.S. mind seeing if the 1.46 invincibility code for Super Mario Maker works just in case? Just to see?