Possible to fix a broken shape key with a copy of the model? I've been using sculpt mode and messed up my horse model's head. I had been improving the eyes and accidently used one brush wrong. I cannot undo it anymore now. Luckily, I have the model before the change found in an autosave file. 
Now I want to do one of the following two (which both lead to the same result, however):
Fix the hole in the head with using the shape of the autosave on the new one
OR: transform the eyes so that they got the similar shape as in the broken one.
I already tried to use blend from shape but it doesn't work with other objects. 
Do I have to join them? Don't the both base keys collide then? 
I cannot just join and replace the mesh because I already got texture on it and I don't want to redo that over again.
Should I rename one basis shape and try to fix it this way before joining both? Or is there any other way to blend from a different object? 
 Thanks for any clue about this.


Edit:



 In texture view there is invisibility, too!


I found that there were two little face holes I did not see. The replacement works then, but the mouth texture and some parts of the head (probably more) are deplaced. Is it possible to assign texture(UV) data only for a selected area of verts?
Copying shape keys doesn't work because they measure a difference of location from a basis, so your mesh should already know which is that basis location. 

You can try selecting in edit mode the eye edgeloop, then with Ctrl++ expand the selection a certain amount of times (as needed, but count them), P to separate the selection. 

Do the same with the other mesh, then swap and Join (Ctrl+J) the meshes, remove doubles and adjust where necessary.

If this method doesn't work I think you need a little Python script to copy location only, of selected vertices from one object to another.

Consider also the idea of starting from the correct mesh and copying all other vertex data from the textured one (Shift+Ctrl+T for vertices/edges/faces infos; select target, shift select source, Ctrl+L "transfer UV map").