Well, to be fair, I wouldn't kick either out of bed for clawing the sheets, but they certainly were not Caitians. And since they were not identified as such via dialog or readable labels, I can just ignore the intent "behind the scenes".
We already know there are more felinoid species out there, even in TOS's time, so yeah I just assume it's another race than resembles humans slightly more than the others.
Saying that though, they were cute. The glowing eyes could be a little creepy up close but still.