Most central and South American male ciclids are larger than the females and have a longer dorsal fin. If the markings as juveniles include stripes, a lot of males types will eventually lose the stripes, while the female maintains them, like red terrors. I think the male jaguar cichlids
Get a more pronounced jag. Pattern.
I've never owned jags. But have kept numerous varieties of new world cichlids. At 4" your fish is probably at a point where sexual identification is possible. Jags are very commonly sold in my area and i' m sure there is abundant research material available that will help you. Post a photo when you can.