Without commenting on anything else, all I will say is that I just loaded up a Prophet V3 and a Matrix 12 V-2, I stripped down both of their patches to just the sawtooth waves, played them at both the same pitch, and then ran each VST through their own oscilloscopes.
Let me tell you, the oscillators are DEFINITELY different, just going off of the scope you can tell that there's a big difference between at least those two VSTs but I can presume the others as well.
On another note, the different VSTs bear different amounts of authenticity. The Arp 2600V notoriously doesn't sound like an actual Arp 2600. Meanwhile the Matrix 12 V, going off of this video, sounds incredibly like a Matrix 12.
https://www.youtube.com/watch?v=tfi-nZBDOsY