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According to a less than reliable source I just Googled, the average mass of a human hand is somewhere between about 300-600g. That, to me, sounds like a 100-200g difference would be huge in generating momentum. Yes, you use a lot of angular momentum as well, but even then L = r x mv, so mass still has a great effect on momentum. Generating torque with your body is about increasing the velocity of your punch, so while your legs/core help with moving your hand as fast as possible, it is still your hand that is landing on your opponent and causing the change in momentum. I think the difference is much greater than 0.5%, to be honest.
You are correct.