Well find out for sure, but the most commonly available clown is the ocellaris also known as the false percula. I'd be a bit wary of a fish store that just calls them "common clowns."
The yellow-tail damsel IS tamer than most. This was the first saltwater fish I owned, and also the only "original" fish that I still have. It bothers my maroon clown quite a bit, but thankfully the damsel is mostly a poser, it barks but won't bite. There is no way I could get away with it in a smaller tank though, it would cause lots of problems.