The fastest way to check is by looking at the cards texture, holo finish, font spacing, and card back colors
However, like with any Pokmon set, especially one driven by nostalgia, there are some cards which are simply more desirable and more valuable than others
Im honestly surprised they dont ship older booster boxes worldwide like other companies around the world whenever WotC releases a set like War of the Spark or Strixhaven with Japanese alternate art cards, theres a strong demand that tends to hold even years after release
Protean Hulk Once a [wrongful] victim of the Commander banlist, Protean Hulk was freed in 2017, which paved the way for the later [rightful] banning of Flash
Nevertheless, it is a worthy entry into the hall of fame for white draw cards, and it sees multiple reprints to keep it cheap and affordable to whoever needs it