What is inside the "Metroid Prime 4: Beyond Nintendo Switch 2 Edition" box?

I operate a public library in Germany and recently purchased Hades II, which includes a cartridge compatible with both the Switch 1 and the Switch 2. Metroid Prime 4 is currently discounted. The Switch 1 edition costs 52 €, while the Switch 2 edition is 63 €. If the Switch 2 version works on the older console, it would be the better long-term purchase. It would remain compatible for current borrowers and provide improved performance when I eventually play it on our console over the winter break.

However, if the Switch 2 edition only includes a one-time upgrade code, that would not be acceptable, as a single-use code would effectively waste 12 € and lave behind a Switch 1 game with the wrong packaging.

I need reliable confirmation: What exactly is inside the Switch 2 Edition box.