If an out of shape Toney can go toe to toe with Sam Peter then an in shape Toney would beat Morrison. Probably by stoppage.
I see this being a close fight. Toney using his superior boxing skill to land lots of clean punches and make Morrison look bad at many points throughout maybe even sending him to the canvas by catching him off balance. The Duke with his physical advantages I think would be able to win a number of rounds by keeping a high work rate and working the body, could perhaps knock down or hurt Toney at some point with a left hook.