Dak is much much better at extending drives and moving the ball. Dak wins that game.
I don't know why we try to project how our players would do when it is impossible to know that. Maybe if Dak was San Fran's QB, he throws a crucial interception or fumbles the ball trying to extend a play.
I've always felt that Romo would possibly have ended his career with a ring if he had went elsewhere for his final few healthy years, but there's no way to know if that would have been the case. It's a guessing game because games can turn on one or two plays positive or negative.
And I'm not saying the 49ers wouldn't have won with Dak at quarterback. Who knows? For all we know they might have scored in the 40s. It's just impossible to project.