Zoo times him and knocks him out. I mean, I don't care all that much for Zoo, very overrated fighter in some quarters, but this one is easy to call.
Kosta wouldn't even need to connect, the displaced air from one of his right hand bombs brushing past Khan's chin would be enough to KO Khan cold. By the time Khan regains consciousness they would of declared him dead and lowered his coffin into the ground.
Lol lol lol Unless you are talking about Now. Even then if both can safely get down to 140, tszyu will spark him.
The only questions are how long it takes for Tszyu to time Khan, and how much longer Khan would last after that.