Switch 2 boxed game codes and upgrade codes in different country? Will this work?

So for my country (Belgium) it has become cheaper to just buy switch 2 games in France. For example I pre-ordered DK Bonanza for 50EUR including shipping.

Now I was thinking about doing the same for the Pokémon Z-A game (switch 2 version), but I'm not sure this would work? The cartridge itself would work yes, but the code included in the box for the switch 2 version upgrade would probably not work on my Belgium region account right? Or are these global or at least EU codes?

Does anyone here have experience with other game codes or upgrade codes from the Switch 1 area and if those are global/EU?

Another route I could take is just buying the French switch 1 version of Pokémon Z-A and then buying the upgrade through the switch 2 store. This assuming that the cartridges itself are still global and the store would let me buy said upgrade for said cartridge.

tl:dr:

1. Are switch 2 game upgrade codes global codes or at least EU global codes?
2. Are switch 2 cartridges still region free and can DLC be bought for them from any store region?