looks to me like you have a male and a female.
Sexing. Look at their dorsal fins. The first two spines are longer on the male. Males also show more color and grow larger. Females are stockier, plumper, and have blue spangles in that black blotch (males don't). Females also get a faint pink blush on their bellies at spawning time.
A sure fire way of sexing your Rams is to check the black blotch in the fish's side. If there are blue spangled dots in and around it, that's a female.
Females also tend to have a black stripe on the front part of the first fin on their bottom (sorry have no idea what it's called... lol)