Not sure how these two greats would interact in the ring, especially considering their similar styles this discussion seems very interesting. also sorry for all the low quality posts lately ill try to do better.
Tyson by TKO. Tyson repeatedly drops Frazier. Tyson was a faster, sharper and better puncher than Foreman with almost just as much power. Tyson would have the hand speed and accuracy that was Ali like with Foreman like power. If and this is a big if, Frazier could make it to the late rounds, he will have a chance. But Frazier was 205 pounds at his peak and Tyson was usually lethal vs lighter opponents. Tyson was close to 220 pounds in his peak.
I don’t think Frazier fares well against Tyson. Tyson TKO I would wager. If his chin were a bit stronger I’d wager his stamina and skill would set him up for later rounds
Tyson by early KO you have one fighter who is known as one of the fastest starting Heavyweights of all time with a handful of early KO's vs a fighter who is known as a slow starter. I guess there is a chance that Frazier could weather the storm and stop Tyson late on but I think Tyson is bad style match up for Frazier and stops him early.