Yes, the first picture shows a faint indication of that typical round spot at the end of the dorsal. And there is an indication of a further typical marker of the species: a thin black stripe exactly at the borderline between body and anal fin. Compare it with the good photos of sumatranus. There is a third possible marker, too: a comparatively slim body, compared with typical bintan-forms.
Nevertheless, the last information is given by that strange courtship only. Clearly, the final seller is mostly incapable of telling you exact informations. Often, even the exporters cannot do so, because they are not interested in such questions. And if they are, they do not freely spread them: they fear the revealing of goog catching areas to other companies …