Different type of polyp

[NewReefer455]

I recently bought some general brown polyps for some ground cover in my sump refugium and there seems to be another kind hitchhiking on the bottom of the frag. Are these just adolescent polyps of the ones I have, or is it something else all together?

 

[F i s h y]

looks like a different kind. Possibly a zoa. Instead of the larger palys.