I don't know if it is the same or not but it looks close to what you have.
This tiny snail is a predator of zoanthids, and may be tough to see in your tank. Watch your zoos closely at night for this Sundial Snail, and if you discover one be quick to remove it. For the next few days & weeks, keep watching when the zoos are closed up, in case any baby pyramid snails appear. Discussion and more images on ReefCentral.com Not reef-safe!