how does the side deck work in yugioh Tutorial to Build a for AUG 2023 format! What is a side deck?

Here is a comparison for you: My question is: Why is there no differentiation between the labels from PSA for cards like that

For example, if players A and B each control a Shay Cormac and player A has put a bounty counter on player Cs creature, both players A and B will put two +1/+1 counters on their respective Shay Cormacs when that creature dies.

Featuring Pikachu dressed as Mario and Luigi, these cards quickly became collector favorites and naturally, highly targeted by counterfeiters

Ultimately, her downfall proved to be her attempt at cracking into elf themes two other elf commanders better serve the tribe in Marwyn, the Nurturer and the reprinted Ezuri, Renegade Leader