None of them are photobombs! As you said yourself and I quote:
"A photobomb occurs when some third party interferes with a photo in a way that shifts the focus
from the original subject to the photobomber."
How are they third party? They are just main subjects with faces swapped, no third party photobombing the picture!
The rules are now changed... the original intention was to be just a photbomb, but it seems to be more suitable for the contestants with the freedom of choice so that from now they can do the photbomb or change the faces.
Thank you @steemtoons