Yeah they look like Macmasteri to me. I have a wild pair that is identical to them. If it is anything past wild or F1 it can be almost impossible to tell for sure as they have been bred out to have the red coloration on the chest and shoulders. Some Macmasteri's may even be hybridized with true Viejita's but most likely they are line bred to have that color. The Macmasteri Complex, which the Viejita falls under, will have black spots under the dorsal fin. A true Viejita I belive has black markings on the ventral area but every Viejita that has been positively identified as A. Viejita has reddish tips on the dorsal spines and a round to slightly squared off tail.