Join Date: Jun 2008
Location: Just outside Kitchener, Ontario
Bikes: Nishiki Continental, Bilenky custom travel tinker, home built winter bike based on Nashbar cross frrame
If I read your question right, you are asking whether you can run 9 speed Campy shifters connected to a 9 speed Campy Der. on a 9 speed Shimano/SRAM cassette. The answer is yes, but - well, maybe not.
First, the distance between cogs is different on Shimano vs Campy. This means you need a different amount of cable pull than your levers would naturally give you. The JTek shiftmate would take care of that.
But the other part is that Campy RDs are not rated for an 11/34. They don't make a long cage version, as that's generally a MTB part, and Campagnolo abandoned the MTB market years ago. Most of us Campy-lovers wind up with Shimano RDs (and typically FDs as well, if we want a wide range triple), and a shift-mate so we can still use our Ergo levers.