I would take 2000 version of Zab to knock Khan out within 6 rounds. Khan goes in straight lines and he's cannon fodder for Zab's left and he doesn't exactly have the chin to withstand them.
Not sure, but if Khan would be able to land like he did when they fought the younger version of Judah would have bitched up all the same.
Yep. Only difference is surely the younger version of Judah would have offered more offense before folding, and would have had a legit chance of KOing Khan. Probably a pick em fight really.