12S vs 10S for new builders

Google esk8 calculator

Nope they have the same gearing and kv. They do however use 97mm and I use 90mm. They are up at 70-80c quite often and I never reachd higher than 68c

That would be it then, 97xpi vs. 90xpi. Thats the difference on one spin. Belt tension, motor size and cabling length play a role as well