I think we were told that the E80's samples come from the RD700SX, the G70's from the FantomX, but from listening to them, I have a feeling that the raw samples come from the same sampling session, but have been tweaked a bit differently. Just my opinion, though. Listen for yourself (both pianos are at Purgatory Creek - Fantom and RD, though, no arrangers, yet).

This is the best thing about P. Creek... Got a difference of opinion..? Go listen for yourself, don't listen to US!