These are supposed to represent a Zapotec Jade stone mask, and a Mayan Jade stone mask.
These ones are really made out of paper mache and wax. Real ones would be made out of the Jade stone.
The ape like one is supposed to be the Zapotec one. The Zapotec culture would often make masks to look part human part animal.
The Mayan one is whatever. They would often use Jade stone- but what the mask was varied.
This is supposed to represent an Aztec Mosaic Mask.
Altho a real Aztec Mosaic would be made out of turquoise, rock and stuff.