Tonyptony, I think all Venustas are the same too. The statements I made are what I am sure of. I can call Purist tomorrow and find out if Venustas had any variations or not.
As for comparisons between Kubala and Purist, I will leave that to those who have made a direct comparison in their own system. I heard a comparison in two systems owned by one of the guys in my audio group and both are excellent cables. You could not go wrong with either cable and I'll wager there will be people on both sides claiming superiority of one over the other.
Remember I am friends with Jim Aud at Purist, I even sell his products here at Audiogon and do photography for his ads. You can expect me to support his product because it's been my favorite cable for more than 20 years (19 years longer than I've sold it :^).
Still, there are lots of great cables out there. Far more choices than when Purist came on the scene 20 years ago. I've heard systems with almost every brand of cable and many were state of the art. It's about achieving balance.
I hate to throw this out, but you have to try these cables (Kubala, Purist, Elrod, Cardas, etc) for yourself to discover what works best in your system.
Cable company will allow you to borrow several brands to test against each other. Ultimately that is the only way the debate will be resolved for your own system and personal listening tastes.