Hey! Working on the full version right now. I think for the new content I may keep it mostly unchanged... It's a new vision and I think it's okay to leave it the way it is. However... I will probably still keep the battle theme for that area as pepper steak, just so it's consistent through the whole game.
Makes sense to keep the new areas unchanged since they're new. Also makes sense to keep the battle theme as Pepper Steak for consistency.
There are some unused Tracks that might be good, but it is probably best to keep the original ones as is for the new areas, and do replacements with the new areas later if desired.