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I personally would not breed with specimens from different locations, since recent research suggests that different location usually means genetically different species. Because of this, most tank bred strains of "superspecies" like A. cacatuoides, A. agassizii, A. bitaeniata etc. are almost...
I've heard that there have been cases where exporters have allegedly put females of "similar" species together into the same tank and then sent them out randomly with males of the two species. In this way the wild caught parents of these fish might already have been two different species. Imo...
If they were A. feconat I would expect a larger caudal spot (male and female) and a larger lateral spot (female). Moreover, on all pictures of feconat I know the males show at least some (often many) dark scales in front of the caudal spot, particularly below the lateral band.
If they are hybrids I would refrain from breeding them at all.
I can't tell you a number. It's just that I personally have no idea which other nijsseni-group species it could be and together with the deformed scales of the male, for me, hybridisation is a likely explanation.
Maybe A. (cf.) sp. Nadelstreifen. They are found near Leticia where also a form of A. cf. bitaeniata is found. But without knowing the catch location or seeing better pictures of the fish in different moods, this is merely one of several possibilities.
"don't always" is quite euphemistic ;-) Show some pictures of them, preferably in different moods, then it should be possible to tell whether they are in fact D39.
Btw. the correct name is A. sp. D39.
Watch out for the metallic green/blue lip spot shown only by males of all agassizii-sublineage species. It is found on the lower part of the upper lip near the corner of the mouth:
The larger fish (male) shows a caudal pattern not typical of A. uaupesi. It could be A. lineata, but from this photo alone and without knowing the catch location, it's impossible to tell for sure. The smaller fish is for sure not uaupesi because it's a macmasteri-group species.
I see nothing that speaks against viejita - it might just be a particularly colorful specimen.
However, I have seen similar fish showing more red coloration on the head than typical viejita that were said to be from Cumaribo (Vichada). So, I would better call these A. cf. viejita and never keep...