I have a 1963 40 hp johnson electric shift outboard model RD25D that i am useing on my boat right now. I know a guy who wants to sell me a 1964 40 hp johnson electric shift outboard model RKL 26R real cheap. There is nothing wrong with the motor that he wants to sell me. I even think that it runs better than mine. What i am wondering does these parts change out with each other so that i could use one of the motors as a part motor?