Roadster vs RPU subframe

[MN Stumpjumper]

I'm putting together parts for a 29 RPU .
I have a good roadster sub frame, can I cut the back end off and use the front part for the RPU? Are they different?
Anybody have a RPU subframe for sale?

 

[Roadster62]

Ask the folks at Brookville, I think you just need to add the rear subrail crossmember to what you have.