correct, the sensors changed for 2k and btw are less expensive than the early C5 sensor. Keep the sensors on the same corner or you will have to go through the learning procedure to reset. If you are swapping wheels complete with new sensors, just go through the learn procedure which is quick and easy.
You don't really have to reprogram them as long as they go back to the corners they came from.
Where are you located?
If you want to come by the house I'll show you how it's done.
I'm at Brownsboro Rd. & Rudy Ln. by the interstate.