What Eubank said in the first place doesnt really make much sense...

but what X is trying to say is:
Pressure = Force / Area
Thats a fact.

So if there are two guys who have the same force behind their punch but one of them had a smaller fist area, the guy with the smaller fist would put more pressure on the person or thing he punched.

I dont think this makes much difference tho since boxers generally wear gloves :P