Does each satoshi have a unique identifier?
Bitcoin Ordinals protocol
( launched in 2023, just DYOR) allows to inscribe each individual satoshi and set to them the unique identifiers. Those satoshes can be traced (
with the relevant wallet app, like Ordinals Wallet) and traded . Moreover some people believe that so called rare satoshis are more valuable that other ones and sell/buy them on overestimated price. I'm not in their class and believe that all satoshis are equal in their value.
All bitcoin are equal in a perfect world but world is not perfect and third-parties will add metadata to the transparent Bitcoin blockchain.
If you really think all bitcoins are the same value, would you trade your BTC with a BTC that is known to be stolen from an exchange ?
If the answer is no, then all bitcoins are not the same.