i'm not sure you can pre "read" any data regarding newgens, atleast i remember not long ago when you could load up your save and some of your players could suddenly have changed either picture, nationality or other small things (not attributes)
But my guess is that with time you could have gathered a bunch of newgens Id's and could just drop them into a new save and if that id came up it would already have a preset face. That said, i am not aware IF informations change on a ID from save to save.