Possibly. But more than likely same result. Some are game risers. Whenever Marciano thought he was behind he turned it up. His KO of Charles in an act of desperation in the second fight is one of the most crazy sports stories ever.
Charles moved a lot and stayed away from Louis but he would not have fought Marciano the same way and he said as much in interviews. He, like Moore and Walcott, believed that Marciano was easier to hit than he ended up being; he would have fought him the same way. The difference would be that Charles would have been a few years younger.