[helene schoubye]

Your description, Bartian, suggests, that there has happened a mixture, indeed. Whether in the shop or even in Asia already, one will never know. But we cannot be sure. A clear indication is not the colours of the ventrals, but their structure. That must be nearly identical with males and females. Even the two males don’t need to have been different species. Sometime, a dominant male is much more colourful than another one, being suppressed a long time. It might develop.
But the given location is strange: “Borneo”. It can be a mistake, naturally. But surely, there are Borneo-species sometimes traded, and some are rather similar to bintan and bintan-like forms. For instance opallios. And there are other Paros with a rounded caudal from Borneo which are not yet described. It may happen that some occur suddenly in trade in between other species. So we cannot be sure. But your description fits spec. Sentang and that form is the most traded Paro during the last years. But it’s location is the Sentang area on Sumatra only, I am sorry!
So, you have an interesting task: Try to breed your fish. If it works, both parents can be of different species nevertheless. But then the two are closely related. Or even identical. So let’s wait for spawning and offspring! Good luck! Peter