From the pic above it looks like it could be a "prognatus"/pantanal, with the depression on the top of the head and "v" shaped stripes. Could be an Ecuador also, it's not the best pic for IDing.
Answer to your question about locality variants: Yes, I have several mala variants: "regular" mala from Peru, "prognatus" from Argentina, Vennezuela mala, and I HAD a smaller "brazil" mala (not really sure though). I say HAD because although the "brazil" could hang with the Peru and "prognatus," but once the Venny was added all hell broke loose. The Brazil was the only casualty though, and the rest live together, but they still have their scraps. Each has it's own attitude/behavior: the "prognatus" is very active and more mid/top water, hits the surface of the water hard and handfeeds; the Venny is almost scared to hit the surface, but is incredibly aggressive on the bottom when feeding. I've also kept a very large Ecuador "blue" mala before as well.