Your photos are excellent, but your fish are not fully adult and the males (you have two) not fully coloured. The typical marker-combination of adult male P. sumatranus are missing, but somehow faintly indicated; I cannot exclude that they will develop still in the next months.
My suspicion is that it’s not sumatranus but an interesting variant, no doubt. If it is, you are moe lucky than as an owner of sumatranus. That rarely happens today, but it does from time to time. The destruction of the old habitats force the catchers to look for formerly unexploited areas, and some small or difficult to be accessed will have survived.
Things remain open until they display.