You're blind, dude.
Count the ridges in the hair, the goatee, eyebrows. You can see in the goatee a pit in all three of them.
The patch has 3 large hair bunches right below the lip.
The moustache on all three on the left has that inward sharp end.
All three of them have beard/sideburns sculpted in, they're just shaded differently.
If anything, ONLY the one in the middle may be slightly different because it looks it has a glop of hair going downward. The other two have a sharp downward hair edge to the left of the brow.
This is despite the hair on all of them have the same amount of hair ridges moving in the same directions (and same eyebrows, mustaches, beards, etc).
Of course, this might just be the camera not being focused well and the hair piece might have moved
Or could just be a molding issue. Molds wear out over time and since this is 3 figures, there could be a million figures made from the same mold.