When they made the chips, they are the same. Then as they added the labels to the center, they are randomly placed front or back. Maybe I'm blind, but they all look like the same chips, same inserts and the order is the same on all of them.

Just about every chip ever made, with two different sides, two colors, is going to have some with the inlay on one side or the other, or hot stamped with number on one side, casino name on the other.