22T Mod1 Pinions

I'm not sure if it runs hot with the 18T, because the only night that I ran it, was about 29 degrees F. When I was researching the center transmission options, it was recommended to use a 51T spur with a 14T pinion, which is almost the exact same gear ratio as the 65T/18T combination that I'm using. If the gear ratio is the same will the motor have to work harder to spin the 65T/18T combo vs. the 51T/14T combo?