I thought that the very concentrated look on her face was very intense when I picked the cover up. But no I have seen both there is even the same bit of slobber of the horses right fore leg -so I agree, definatley photoshopped!
On another spot the difference, they have removed a bit of menage that is flying past the right hoof for the cover, but can be seen on the other one.
Sorry, I always got carried away with games as a kid too!