Although many aquarists may have the impression, location variants are just about looks, there is much more at stake in these adaptations.
The Lagoona Chairel variation (that I kept) is influenced by weather patterns, and inundations from the sea, that more inland population do not necessarily experience..
Winds and storms sometimes bring cold, saline conditions, that require the Chairel population to evolve differently.
Lagoona Chairel being every close to the Gulf of Mexicop is somewhat brackish during the dry season, and winds drop water temps significantly, and pH rises above 8..
Whereas during the rainy season, when influenced by torrents from inland rivers conditions are quite different.
That survival of the fittest gaunlet has toughened its populations, to survive pH and salinity variation some other population may not need to have evolved in.
I have tried these carpintus in my ponds in Milwaukee, where water temps dropped onto the 50s'F (Teens C) with seemingly little effect.
Its not just about color, or iridescence but about a robustness in health tolerance.