emps have more spots and circles, that is a hard question to answer and takes quite the time to get all the pics. You would be better served buying a book on marine angelfish and learning the differences yourself. Then you will have a reference for later and can read up on other species of angels. Emps are probably the most obvious juvi though if you pay attention to detail at all you should be able to pick on emps real quick, others may be harder to ID.