Nice work!
Yet; am afraid it is a bit more complicated than that...
The male of both species goes through changes in colour and physical appearance depending on mood.
It is really facinating to watch them "morph".
These two pictures are of the same male C. irrubesco in two different moods.
Nice?
The male Carinotetraodon also have a "crest" or "keel" which it will use in courtship and aggression.
The fish will expand the top and bottom of its body in order to appear larger.
The picture of the male C. lorteti shows this in a really nice way.
Great fish!