Vive - Two Controllers doing the exact same thing.

I have this painting app I've been working on and been testing with just one vive controller. Now I need to add the second controller so that two people may paint at the same time. Both controllers need to do the identical thing. Is there any reason I can't drop the same controller class onto both controllers in the steamVR camera rig? I tried that the other day and it sort of worked - except there were times when one controller affected the other one. Is there anything to watch out for where they could interfere with one another?