I thought they are clones, because they all look alike, and that somehow China got help from aliens to create them. It was a secret until now, but it's now allowed to be said: They are actually the new official central asian race created by Gensokyo, for use in China, Vietnam and bordering areas.
For east asia, Korea and Japan, they made the corresponding big tit tall version. The males of both are fairly similar and can't be told apart visually.
It is possible to choose a future incarnation via either of their respective Earth Mothers.
