I think the different....
1 = male, wide head shape, eyes further apart, longer cheek odonthodes
2 = female, narrow head shape, eyes close together
3 = male, probably dominant male, wide head shape, placing of eyes, long cheek odonthodes and longer odonthodes on the pectorial fins
4 = female, see above description
Here a picture of my breeding group of L66 (aged over 10 years old, wild caught) for comparison...