It's clocked the same and has the same feature set.
Nothing is different.
The core contains four pixel pipelines, each capable of rendering one pixel per clock with two textures per pixel. Four pixels per clock at 200MHz gives you a 800Mpixel per second fill rate. And at two textures per pixel, we're talking a 1.6Gtexel per second texel rate. Of course, those are the same performance numbers that a GeForce2 GTS has, however, things get different when you look at the memory. At that clock speed, riding on a 128-bit memory bus, the 3D Prophet II GTS Pro has a grand total of 6.4GBps of memory bandwidth.