Quite a few of these aren't EU members, some aren't even in Europe; do we know why they were added? e.g.: Switzerland or United Kingdom; but also Oman or United Arab Emirates.
Norway is in the ECC together with Iceland, but for some reason Iceland is not on the list where these SKUs will be available.
It's everywhere Nintendo of Europe (the subsidiary in the EU) operates.
Storage, and distribution costs.
It's easier for Nintendo of Europe to switch over everyone than to stock and supply 2 versions of every product. Also I'd bet most of their sales come from the EU countries where the replaceable battery requirement is forcing this new SKU deployment anyways.