I read before that a pitbull trained to fight pitbulls struggle with the thick coat of the kangal but a pitbull like one that is used on bears that grabs the nose or paw will do better.
There was a red pitbull in with one who gave away a big weight difference and lasted a good while but eventually lost.
Maybe if the game pitbull was bred larger and specifically to face kangal type dogs it cud be a different story