Well, I know the title screens are different, lol.
Beyond that, not sure. I am pretty sure though that the Japanese X-Men, The Simpsons, and Aliens all have some some notable differences from their US counterparts.
I might resort to that if I can't get an original Japanese one for a reasonable price. I managed to get an original Japanese The Simpsons board from here in the States, so I'm hoping I can have similar luck with this one.
I know I'm weird and this is probably a long shot, but if it is a Japanese-made game, I like to try to get the Japanese version first if it is economically possible.