I'd have to look closer at the specs of both of those motors, but the first thing that jumps out at me is how long they both are and how heavy they both are, the more expensive higher output one is almost twice as long and getting close to twice as heavy too, at least I think I'm looking at the right specs... but the smaller and cheaper of those two motors is shorter then then even a golf cart motor, so while you might be able to get away with running it at a higher voltage if you force cool it, it's really hard to say, D&D along with other motor companies tend to be pretty good at telling you how far you can push their motors.
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