Tate's kickboxing career is fluffed up but he is a MW so there would be a size difference and Cerrone was washed as hell before he retired.
The Cerrone that TKO'd Rick Story could probably beat some mid level MW's and beat up Tate since Story was a really underrated WW but now days the last footage we have of Cerrone is him getting bullied by Price, Morono and Miller. Even if Cerrone is TRT'd up and looks good physically he's lost his durability so I doubt he handles or reacts to the power well enough to win or even survive.