All GF2 Pro's have a 200/400 clock at least, one or two manufacturers shipped GF2 Pro's that were guaranteed to overclock a small amount beyond that.
A few manufacturers shipped GeForce2 GTS Pro's, which clocked in at 200/366... but they werent true Pro's they were pretty much GTS cards that tried to cash in on the Pro hype.
The classic GTS of course runs at 200/333.
If his card runs at 200/333 then he's got a GTS there not a Pro. And that 70MHz memory clock differential makes quite a performance difference for the bandwidth constrained GF2 core.