We all know how difficult it is to identify the sex of these fish, so please post a picture in here and we'll try to help you (or at least give an educated guess!).
Based on the last photo I would say that one of the left was almost definately a young female. The one on the right however could prove to be a young male if it's odontodes (whiskers on its cheeks), continue to grow. Is the fish on the right quite plump form the side also?
Rob
The perfect white lie..."Of course I didn't pay that much for the fish honey"