Noooooooo, you're breaking my heart.
I really doubt that it's either. All the other international versions keep the original soundtrack, probably because it's much more expensive to replace it with a new one. The music is included in "the package", so to speak. if anything, Saban invested more money into localizing Digimon than anybody else, because they also had to hire new screenwriters, editors, composers, singers, etc.It's my understanding that it's generally a music licensing issue that prevents the Japanese soundtrack from making it Stateside, but I wonder if it's more just a cost issue or if it really is a legislative one?