If it's current Kakashi with intent to kill, he could take it high difficulty. He can use kamui much more often, he is also smarter than Sasuke in a fight. Kakashi has shown to be capable to feint even Itachi or Pain with his kage bunshins. Itachi is definitely smarter than Sasuke, so it's possible that Sasuke could be fighting a clone without him knowing, which could give Kakashi a great opportunity to warp him from an unknown position. He doesn't spam MS techniques useless in the contrary of that version of Sasuke. He did use Kamui to warp Sasuke arrows from short range because he was surprised at that moment, but after moment of surprise, he has the arsenal to prevent himself and find some opportunities(clone, doton hiding mole, doton wall or others). On the other side, Sasuke has nothing that could prevent him from a kamui warp