I have heard of a lot of people who keep GTs with Oscars, believe it or not. Whether they are male or female GTs is a different question.
RTMs and Salvini do share color and pattern similarities, but the adult shapes are very different from one another. RTMs are from the Parachromis genus, known for "monstrous" behavior in aquariums; this genus includes the Jaguar, Wolf, Yellowjacket, False Yellowjacket, and Loiselle's cichlids. They can be difficult to convince to "play well with others" and may end up as "the fish you leave alone and it will leave you alone" or it could simply kill everything in your tank because it "had a bad scale day".
Salvin's falls under a recently added genus, "Trichromis", (which appears to be monophyletic) but was previously classified as Heros (and likely others), which is a generally peaceful Discus-resembling group of fish. I think we should both wait and see how many more times the scientists are gonna change things before we decide what it's best tankmates are for now LOL