What’s not to understand is why you don’t name specific songs that you’ve checked, or answer exactly which 2010 folder you used. What I can understand is the RBHP does not touch any official content; all the upgrades are overlayed using the separate dummy and upgrade files. Also, the RBHP doesn’t have any Green Day harmonies, since those are provided by the RB3 disc (and the GDRB disc before then).
You are about to leave Rhythm Gaming World and access the external songs DB. While no song or file sold for commercially available videogames is hosted there and only fan generated content is allowed, Rhythm Gaming World has no direct control over the database and no files are hosted here. Alright, we had to made you aware of this, now you can visit the database!