This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
It's possible these sporelings are a subspecies of the main group given their unique skin tones and living in a cavern rather than the large mushrooms of Sporeggar.
Msshi'fn mentions in  Glowcap Mushrooms that he collects Glowcaps to "trade with other sporelings". However, there are no other populations of sporelings outside Sporeggar other than the sporeloks (and the likely resource-less Sporeling Refugees). The sporeloks may be the implied other population/faction/tribe of sporelings for them to trade with.