Every single satoshi on the Bitcoin blockchain are completely equal and the same. Now if you decide to pay more for an arbitrary coin, that is your own personal choice but that doesn't make those coins "rare". As it was said, Bitcoin is Fungible.
https://bitcointalk.org/index.php?topic=5510649.msg64575180#msg64575180Perhaps this is a good explanation of why satoshis can be tracked and how. Simply by assigning ids and tracking them, you can identify rare sats. Lmk if the referenced post makes sense

. Thx
The BTC software assigns a name and number to every sat that has been mined and will be mined. This is done from day 1. The names and numbers of future sats that have not even been mined are already named and numbered. It is a built in function of the blockchain. These are not added on to them after mining.
You can look up the final satoshi that will ever be mined and it already has a name and number assigned.