Any 9mm Star is much larger and considerably heavier than the Star .380s.
(One of the jokes about the Stars -- which are fine guns, by the way -- is that they are so heavy that if you can't shoot the bad guy, just drop it on his foot, and he'll be out of action for a week.)
I've had several, and prefer the Star Firestar model, which is double-stack (with 10 and 13 round mags available.)
Just about anything you want to know about the Star line an be found at this site:
http://www.star-firearms.com/firearms/guns/firestar/index.shtml