There are a lot of differences between these two frames. The nPS 95 is very similar to the nSix-One 95 Team, but not the regular one.
First of all, like you mentioned, the nSix-One 95 is heavier and more headlight. The nPS 95 is more flexy and has a denser string pattern (unless you're talking about the 18x20 version of the nSix-One). Overall, the nPS 95 is more manuverable and much lower-powered than the nSix-One 95.