No and yes. The technology used in the S-series differs from the technology in the CP4 Stage, so no, the “Voice” is not transferable between products. However, Yamaha gives you three principal acoustic pianos in the CP4 Stage: it has the Yamaha CFX, the Yamaha CFIIIS, and the Yamaha S6. Each piano provides 15 complete voice sets both stretched tuned and flat tuned, stereo and mono, etc.

The Voice you speak of, “Full Concert Grand” is made from the Yamaha CFIIIS acoustic grand. As voiced in the CP4 Stage it utilizes the Spectral Component Modeling engine to reconstruct the sound. The S90 XS is strictly sample playback.

While the Voice data is not the same, the character of the acoustic piano sound is.