I am pretty sure that I read something on the SRAM website that said all SRAM parts are completely serviceable. I would take that as meaning completely able to be dissasembled and reassembled. So provided that the basic design of the rd's are the same and I am sure they are you should be able to do this. I can recall a thread were one bf member did this with a shimano rd so I am sure you would be able to do it with your SRAM ones.

That being said it may prove to be easier to just buy a rd that already meets your requirements than to run the risk of taking two working ones apart and possibly ruining one or both. Selling one or both off and then purchasing the proper one would be my first solution. But if if its more of acuriousity thing give it a go.