Is a Left Punch harder than a Right Punch?

[Jimanuel Boogustus]

Tyson use to say his right was the most powerful shot but the left hook got the knock outs because it was the one the opponent did not see.

That was Mikes best punch because he's a converted south paw. Same with Cooney, Oscar and several others.

You sure about that?

Positive. So was Basilio, Jeffries and Corbett and they all have the same thing in common. A deadly left.

How can you be a right handed converted southpaw boxing out of an orthodox stance?