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They are all cacatuoides-group species so they are similar. However, other than this fish, A. juruensis has a caudal spot separated from the lateral band.
I would like to add that there are differences in the caudal pattern too: in gephyra, the submarginal band is usually much narrower than in agassizii and there is a lace-like pattern inside of it (often merely in the upper half of the caudal fin).
Imo the shape of the caudal spot points towards A. sp. Rocafuerte but without seeing the abdominal markings one can't be 100% sure. Please show some more pictures in which the abdominal markings can be seen clearly. Do you know the exact catch location?
Another picture like the other ones we already know doesn't help very much. A picture when he is in a mood we haven't seen so far, i.e. aggression or displaying, could potentially be helpful.
I would only call them "A. cf. eunotus (Orangetail) (probably)" if you knew for sure that they were collected in the area where this species is located. But since you have no reliable catch location at all (not even a country), I would just call them A. cf. eunotus.
It's actually very easy: if the said catch location is correct, it's a new form/species and an adequate name would be A. cf. eunotus (Rio Yurua). On the other hand, if it's from some other, unknown catch location, it's impossible to tell for sure whether it's a known or new species. In this case...
It's a regani-complex species. Since the male seems to show no caudal pattern, there are not many (known) possibilities. The first one that comes to my mind is A. sp. Gelbwangen/Yellow-cheeks. However, for this to be the case, the male shows too much red markings on the lower head and lacks the...
The male seems to show split bars all the time - for me it's some form of A. cf. eunotus. In the area where they are said to be collected, there are many rivers which are tributaries of the Rio Ucayali.
It's a brevis-group species, probably one of the piaroa-like ones. A picture of a male with a fully spread dorsal fin might be helpful together with information about the size of the specimen.