Piano 5 vs Grand 2

[Vicky]

The Grand 2 uses a more advanced sound engine with more detailed sampling,Slope Game especially in its acoustic piano sounds, giving it a richer, more nuanced tone compared to the Piano 5.

I highly doubt that. Why should Clavia introduce an advanced or improved sound engine in the NG2 without talking about it at all or advertising it with great fanfare? And it’s a fact that the samples are identical.
I also assume that the only technical and perhaps audible difference comes from a differently calibrated keyboard.