[Peter_Spaeth]

Originally Posted by Rick-Rarecards

I would bet they use gait, speech, height, and other characteristics along with the image.

This is a few years old but its not easy to tell twins apart, https://cacm.acm.org/news/226789-dis...twins/fulltext. You can think of all copies of a card as a twin.

Imagine trying to differentiate among the million or whatever Topps Update Trouts.