My guess (and it's only a guess) is that you can change Drums from one RealDrums type to another RealDrums type, but they are all RealDrums.
Conversely, you can change a Guitar RealTrack to a Piano RealTrack. They are all RealTracks, but different instrument types.

I agree it's possibly a little inconsistent, and I guess that's part of the 'evolution' of the product. Also, the instrument 'name' in the mixer never changes, leading to more confusion.


BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones