Yellow tang & Kole Tang ?

Again, I am unaware of such a species. However, a keyhole angelfish does not have a similar body type to a yellow tang. And a kole yellow eye tang is a bit more square than a yellow tang , will a sharper tail. However they're fairly similar.
 
Never heard of nor have ever seen a Keyhole Tang
Are you referring to the Yellow Eye or Kole Tang?
p-74643-kole-tang.jpg

p-74760-yellow-hawaii-tang.jpg
 
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?
 
depends on the fish and the tank size.

my yellow tank killed my kole tang, so i would suggest caution.

they were fine together for about 4 months, then one day my YT just decided he didn't like his buddy.
 

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