He is more powerful but he is not that much bigger than Ronda and that's why I said big female/small male since they are closer in size.
That being said, Ronda has a solid chance here since Floyd relies on holding and if Ronda can throw Karo Parisyan in training then she can sure as hell get the throw.
Don't forget, Karo is much bigger than Floyd and is a great judoka and ofcourse, Karos grappling/clinch strength is far and above beyond Floyds is.
That being said, Floyd can win if he sticks to a standard boxing while using jabs and footwork but his typical style and boxing pattern will get him hurt against Ronda.