You can save the face room texture as a .jpeg file to any folder you like by clicking on the file icon to the right of the texture preview box that sits at the bottom middle of the face room view. But then you have to reapply it in the material room, if you decide to do some postwork on it in your photo app, which is often necessary, especially if their is a glaring skin tone difference between the body and head texture like you mentioned. I think the photo app approach is better than monkeying with the diffuse colors to get the matchup.