I don’t know who or what Venus Theory is, but I own both Pianoteq Studio 7 and Piano V2, and I can assure you there is no Pianoteq in Piano V.
Pianoteq is amazing. Piano V is… interesting. You can make some interesting synthy piano sounds with it, especially with the glass piano. But unlike Pianoteq, there is nothing remotely realistic about Piano V.
It was actually Piano V that led me to check out Pianoteq and ultimately buy it when I realized I had to have it in my life.
I think the other models V-Collection has in common with Pianoteq (clavinet & Rhodes) and are comparable, though. I actually like to layer the Arturia and Pianoteq models together. Surprising it works and sounds better and fuller than either by themselves.