The first link has two different color insoles present, they might be different productions runs from different factories.
The second link has labels stuck to the insole but they look like off a hand held label printer, not the mandated COO label so I am a little skeptical.
https://www.reddit.com/r/mildlyinteresting/comments/6iewhc/t...
Commenters claim it is done so that people in the factories won't steal shoes since they can't get both left and right shoes.