V1 and 2 aren't texture compatible with Steph or Mike 1 and 2.  Steph and Mike are the same mesh, which is probably why Steph is a bit low in the poly count around the breasts.  The original Millennium Kids are based on the Victoria 1 mesh.

All the Gen 3 figures will take each other's textures to a certain extent.  There's sometimes a bit of weirdness around the mouth area and MATs don't always work properly (A3 has more material zones).

V1 (and 2) were derived from the Posette mesh, V3 was derived from the V2 mesh.  Afaik, V4 is a new build.  And, IMO, a horrible looking one, too.  Really peculiar default shape and a face like a bag of smashed crabs.  And the eyes are too big.

BTW, the original Girl wasn't a Gen 3 figure although they did release a remap which allowed it to take V3 textures.  Girl was a figure by Kim Goossens.  DAZ went through a long drawn out process to acquire it, since Goossens wasn't happy about the Poser fraternaty getting their hands on it and making porno images.  Funny really, since the version he made had genitals.  You can see 'em in the early publicity pics.  Anyhow, DAZ or Goossens ripped out the genitals prior to release.

Coppula eam se non posit acceptera jocularum.

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