vince agrees with vince!! 

as they are all just circle shaped maps, just use the circular crop tool ( in photoshop ) to take the eyetexture from v3,v4, or aiko etc........ and then get the seam guides for whoever you are trying to fit the eye texture too, and the most you are gonna have to do is re-scale the texture to fit the new uv map.

merge layers, save as....... job done.