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Frames are different shapes are they progress along the length, it's not just a wheelbase thing. Body mounts are different in different locations as well.
Probably have to channel the rear part of the Crew Cab floor and get creative with the rear body mounts. I know a guy that dropped a CC cab on a short box frame and he had to do the body channeling. A K5 frame could be better or worse depending on how the frame rails rise or don't. The later K5 frame might be OK due to the rear floor area being same level as the front floor.