Can you swap a 66c20 fslb onto a 1971 c10 fslb frame. Help?

[inkfamous13]

Dont know if this is the right spot for this but ive got a 1966c20 fleetside long bed pick up truck. I lowered rebuilt front end now rearend is going out. Have a chance to buy a 71 c10 long bed complete truck minus motor & trans. Would i beable to drop this 66 onto the 71 frame? Im sure id have to make up some new rear cab mounts or relocate from inside frame to out on back of cab? I think? Just need to know differences if any in shape/ flow of frame. I know there same length and width so if its just a few mounts id be golden. Can buy that 71 swap it out and part out a good truck. I know it all bolts onto the orig frame but would be easier for my situation and disability to lift on and off cab and bed and drop motor in. Any help or expert tutelage is greatly appreciated.