Yes, the US (Funimation?) version and original has different soundtracks, both for the opening and for in the show. I'm not sure which was used in other regions

Yes, the US (Funimation?) version and original has different soundtracks, both for the opening and for in the show. I'm not sure which was used in other regions where the show was popular, my guess would be south/central America got the Funimation music. For example https://www.youtube.com/watch?v=QgJ1heSrskY https://www.youtube.com/watch?v=QgJ1heSrskY