Scotsman-
I think you are right in a lot of ways on this one, there are a lot more factors which would make a difference than at first glance, a few-
How explosive is their squat? (time from bottom to top)
How good is their technique, how much experience?
How balanced are they, what is their core strength like?
I am sure there are quite a few more factors, but if everything else being equal (technique, explosiveness, etc-which I know is just a hypotetical) I would guess the guy with the bigger squat would clean more...