From what I understand, the 9650 is more or less the same as the 9600 Pro. It has 256mb of VRAM but is generally considered a worse performer than the 9600 XT.
There are still a lot of G5 benchmarks floating around the net, and everything that I've found showed that at least for gaming(if that's what you're interested in) the XT is a better performer in this application than the 9650.