There are two ways:

without changing the texture (maps):

• It's mandatory to have the V4 UV template for G2F
• Draagonstorm auto converter can read a pz2 files and apply the map to the correct part of G2F. At the end the plug ask you to change the Uv template of G2F to use V4 template

with changing the texture

• Texture Converter converts the V4 maps to G2F and then you change the textures in the surface tab using the standard G2 template

Daz autofit tool is dedicated to convert clothes made for V4 to G2F not for character textures