I currently ride a '11 S-Works Stumpjumper 29er with the Reba brain fork. I recently purchased a Niner One9 frameset with the tapered headtube and the Niner carbon tapered fork. Both framesets utilize the FSA Campy style headset. My question is, will these two forks be interchangeable or will I need a specific crown race for me to be able to swap them back and forth? Any information on this topic is greatly appreciated.