Yamaha G16 Motor Coupling Squealing, Will my old EZGO motor work?

[jwhranger]

The motor on my Yamaha G16 36V electric whines and slips sometimes when I try and torque slowly up hills. Acts like the coupling is not coupling correctly. Other than when I try and torque up hills it does nothing wrong. If I go up hills with the pedal all the way down I don't have any problems. Runs all day. But I'm about to sell the cart and I wanted to not sell it with any issues. Have an old EZGO (Marathon, not sure what year) motor sitting here and I'm hoping that it will match up.

I am attempting to let the pictures do the talking.

The yellowish label is the marathon motor, the other three pics are the yamaha.

I noticed the rpm ratings are different on the motors, will that make any difference?

Let me know what else you may need to help me please. Thanks very much for the help!