Depends on who the actor is, and how the match is laid out. If Cody is twice as big as the actor, and just beats the shyt out of him, then that's realistic. If the actor looks like a physical threat and is able to hang/get some offense in, that's also realistic. I'd believe Russell Crowe beating the shyt out of The Miz, for example.
If it's a

cac like Jay Leno beating down Hogan with an arm wringer, then that's obviously silly and the suspension of disbelief failure kicks in.
I don't know anything about this actor though so idk whether him vs Cody would look realistic or not.