Hi,
I was browsing my cards and found some uncertainties with regards to the Planeswalker/Intro Decks of the 2015-2019 era, e.g. on Kaladesh. There are a few cards exclusive to the Planeswalker Decks: #265 - #274 (see also in the wiki; https://mtg.fandom.com/wiki/Kaladesh/Planeswalker_decks).
Some of these cards are also listed as "Prerelease Events: Kaladesh" (#265, #267, #270, #273) as well as in "Planeswalker Deck Alternate Art (AER) (PDAA)" (#265, #270).

As far as scryfall can tell these are all the same card: https://scryfall.com/card/kld/265/chandra-pyrogenius and https://scryfall.com/card/kld/270/nissa-natures-artisan respectively.

I guess the same applies to the other cards, not just Kaladesh Planeswalker Decks.

My question now: In which set do they belong on deckbox? They are not promos like the pre-release promos and also not "regular" cards as the main set cards (card #1 - #264). As I said - uncertain. :D
Regards