I will give you a brief history of the more recent figures. Post V4 and M4 there was Genesis. Meant to be a true unimesh, some people had trouble making them work as more distinct genders. Then came Genesis 2. Both of those work in Poser (and I think Carrara) to a certain degree. The Genesis 2 figure had a gender split again. Then came Genesis 3. It followed suit with the gender split.

That being said, each level of Genesis has a Michael and Victoria release. Genesis has Michael 5 and Victoria 5, etc. They are characters derived from the Genesis base.

The mappings vary slightly from genesis level to genesis level with Genesis 3 being the most different from earlier mappings. With each level, bending improves. Genesis 3 has a face rig and more controls for expressions.

I am falling asleep but that might give a basis.

Genesis 3 is the most recent base. It has Michael and Victoria 7 as the main characters, with many siblings.