The difference is Cotto got better leverage and more of his body power into punches. Foreman had a ton of power but besides Moorer I can't think of him one punching almost anyone of significance. He had a lot of power and he would pummel guys, Tyson could do that, or he could spark you out.

But if you have one guy who is 6 inches shorter and the same wieght or more with no body fat, that means that weight comes in the form of more muscle. Tyson had more muscle mass than Foreman, he had more speed than Foreman, he had better technique than Foreman, and he knocked guys out in one punch more often than Foreman.

So I say he would hit something that measures PSI harder is because
A. He's stronger
B. He's a lot faster
C. He has better technique behind his punches.

Nobody has ever gotten better leverage than Mike Tyson (who would have gotten even better leverage if it wasn't for him being so short) That why guys like Holyfield would force Tyson to throw bombs on the outside, and tie him up on the inside because from the outside Tyson was so short he needed to leap in and on the inside he was terrible if you tied him up, he needed it to be clean to get off punches, he didn't know how to work to get punches off like Hatton, Duran, or Holyfield.