NFT’s L1 vs L2

Hi fellow Etherians,

I’m dipping my toes into the development with Solidity.

I’m stuck on a question in the search for Layer 1 and Layer 2 NFTs.

On Opensea most NFTs are on the Ethereum chain (L1). But their are also NFTs on the Polygon chain (L2).

The layer 1 has high gas fees as we all know. But the question I’m stuck on is the “compatibility” of NFTs when it comes to Layer 1 and Layer 2.

Can Layer 2 NFTs be ported (with some kind NFT of burn) to Layer 1?

Let’s say I buy an NFT on the Polygon chain, can it be moved to the Ethereum chain? And will the NFT be still “legit” or “original”? Or will those chain NFT always be separated?

So I got stuck on the question and what better place to ask you nice full of knowledge fellows.

Cheers!