Remember that what we call "acans" in the hobby are Micromussa.
From what I can tell from photos of captive-grown colonies, Micromussa amakusensis don't seem to lose coloration, although the only captive-grown colonies I can find are of the holy grail Micromussa.
Don't quote me on this, but my theory is that M. lordhowensis turns red/orange in captivity due to being a subtropical Australian endemic, since the sunlight there is not as intense/has a different spectrum.