I believe the only interchangable parts coming off would be the fuel pump, and i might be pulling the front mount off pending the person whos interested in buying my car at the moment.
Im not 100% sure where the hard pipe kit will line up, but i know it will definately work with the RB25 if your running a pod filter.
Most likely it will fit, but to be on the safe side, i dont really want to gaurantee anything
I will have the adjustable cam gear that will fit too, however I beleive it has no benefit on the r34 from Bassjunky's results.