I only found out about it myself recently! Wrap3 takes whatever base mesh you input and moves the vertices to fit with a target mesh input, the vertex order is unchanged so you can use the output as a morph in DAZ with no problems. Theres a video on it
here. It's also pretty good at transferring the textures from the new character model to the genesis 2 UVs.
I'm not sure what you mean by the second question, sorry!