This just conjecture, but isn't the body slightly more amorphous then the face? Body-fat and muscle can make someone, even a pig, look different but variables l

This just conjecture, but isn't the body slightly more amorphous then the face? Body-fat and muscle can make someone, even a pig, look different but variables like the eyes, nose and ears generally stay the same (at least past puberty). We also have facial recognition technology already and it may be that it's easier to adapt to another mammals face than it is to work from the ground up again.