Body swap 69 c10 to 75 4x4 frame

[spookyu]

Hello, I apologize in advance if I mess up any terminology I'm not the most experienced "mechanic". Anyway, I have a 69 C10 I bought a while ago and have a strong desire to make 4wd. Fast forward through a bit of research and my buddy helping me out I wound up with the frame to a 75 chevy pickup that is 4wd with the intentions of doing a body swap. We may have jumped the gun though as we just noticed where frame at the cab dips down on my 69 is much longer and the location of the body mounts seems different than on the 75 frame, otherwise everything else seems like we can bolt on or work with. I was just wondering if anyone had any experience with this, if it is do-able? Thanks!

P.S. I can attach any photos if this would help.