Hello, I also wanted to add that if you are using Poser5 or 6 it's even easier to have all the morphs from the Unity plus on the V3 Uvs fit.

Here how you can do....
1-Load the V3 UVS Head
2-select the head by clicking on it and go to the setup room
3-load the Unity plus head and go back to the pose room to resave your new head in the library...

That's it...You got the V3 head UVS with all Unity plus morphs!
Hope it helps!