Paste cut-out face into mask of other face

[Wambo Nr.5]

Hello dear community, I need a little help with a project. Here's... I cut out Jesse Pinkman's face for a
 few frames and want to replace it with Silvester Stallone's face which he has at the end of Rocky I. 
Is there a way to add Rocky's cut out face to the mask so that After Effects will automatically add Rocky's 
face to the cut out portion of Pinkman's face, automatically blending the edges as well? 
Thanks in advance for useful answers!

[Rick Gerard · Accepted solution]

There is no automatic way to do what you want to do. You can track one face, motion-stabilize the other, do some roto on the replacement face, live with the replacement face being bigger than the original face, or replace the original face with the background in the original shot, then put the motion back in the replacement face. Mocha AE would be the tool of choice for almost all of this. 

The only other option would be to Rotoscope the original face and motion stabilize the shot, then just motion track the original face and apply that motion to the replacement face. 

Currently, there is no AI assisted workflow that would make the task a one-click project.

[Wambo Nr.5]

Thank you very much for that fast and exact answer...

I wish you all the best  !

[Rick Gerard]

There are some new face-tracking tools available in the Creative Cloud app that make this a lot easier. Here's a quick overview. The full deal will cost a few dollars, but it might be worth it.