Yellow is from genus Zebrasoma, while Kole is from Ctenochaetus. They should be fine if you plan out your stocking wisely.
The trick for tangs (and most fish for that matter), is to add them at the same time. If that is not possible, always make sure the new tang is bigger than the one that currently lives in the tank. The new big tang shouldn't be aggressive because he hasn't established his turf, and the current tang shouldn't be aggressive due to the other tang's size.
What size tank is this?