Is a Left Punch harder than a Right Punch?

[brocktonblockbust]

I've been watching alot of fights lately where boxers are punching their opponents with left punches, but also sometimes right punches. One time I saw a guy punch with left and right punches, which his opponent didnt really like too much. But after that 1-2, I wondered, what actually is the harder punch, the left punch or the right punch? If you say left, it would be weird, but if you say a right punch is harder, it would be hard to understand. Because wouldnt it matter how much force was put into it, than whether or not it was thrown with whichever hand? I was just wondering about this. And also, would the left punch in general snap back the head of the opponent farther back in a snapping way? I HAVE seen right punches do this, but only this week.