Policy ID is a key identifier for any NFT available on Cardano. Bad actors can take the content of the NFT and mint a fake but they can't fake the policy ID.
This is why you should always check policy ID when purchasing or trading NFTs.
You can find policy IDs for all Equine releases here.
Poster 1: 1ffdf6c98ac7fd8629631bd16c44198b86a9f469760dc5deb5762f61