Interchangable Parts Chevy to GMC

[Doug19]

So I own a 1966 3/4 ton GMC long bed. My plans were to make it into a short bed by cutting the frame and shortening the bed, but I stumbled upon a 1965 Chevy shortbed truck. Both trucks are in questionable shape. I want the finished truck to have the GMC 4 front light assembly. Basically I would like to know if I can transfer my GMC parts to the Chevy frame easily. I will use the chevy bed and maybe even cab depending on which on is in better condidtion. Will the front clip of the GMC easily transfer to the Chevy cab and frame?