According to Oda in the Volume 7 SBS, Kuro could run 100 meters in less than 5 seconds, while Kame-sennin's time for running 100 meters was stated to be 5.6 seconds. Thus, in terms of running speed, Kuro has likely got Kuririn beat, and that might not even be counting the Shakushi, which if not, would make his top running speed even faster. Of course, Kuririn has demonstrated far greater physical strength and punching speed than Kuro, has can be seen by him pushing the giant rock and the little .2 second exchange with Kame-sennin. Therefore it likely comes down to whether or not Kuririn is capable of landing a punch on Kuro, which could likely put him out quite easily. If he doesn't, then Kuro will kill him with the Shakushi.