EZSkin identifies the figure by referencing the geometry file name.

It recognises V4 if the geometry file name is blMilWom_v4b.obj or blMilWom_v4.obj

If you have created a variant V4 which references a geometry with a different name, then it won't be recognised as V4.

EZSkin v2 (under development right now) allows you to work with an unsupported figure, either by manually assigning shaders to materials or by assigning a known figure's configuration to it. This is primarily to support genesis figures imported into Poser, but would work in your case too.

The current version of EZSkin requires that you create a definition in an XML format for the 'new' figure type.

Free stuff @ https://poser.cobrablade.net/