No, I mean the fact that it's a licensed product is probably why it had to be changed. You can't just distribute a license all willy nilly around the globe. You have to take the legal steps to secure the rights per territory. It's why the NES Superman game didn't use the movie theme when it came out in the U.S. It's overwhelmingly likely that while Kemco obtained the license for the music in Japan they didn't have it in America. Same for why Capcom had to remove Norimaro from the overseas versions of Marvel Super Heroes vs. Street Fighter.
So what do you do if you're Bandai and you want to bring your game to America but can't use the same characters? Ya change 'em, of course.