Ah that's great! So it seems to be faster, won't use the data cap, and for some games I'll only have to download a "smaller" patch (for enhanced titles) instead of the full game again? Sounds good.
Unfortunately, there's no "patch" when it comes up upgrading games to Series S|X versions, at least if I'm understanding your question correctly. If you have an Xbox One/One X version of a game, and you copy it to the Series S|X, it will then download the Series S|X version of the game the next time you try to play it which will be a full size download.
Smart Delivery means your console will download the right version of the game when you try to play it, not that it will incrementally patch whatever differences exists between versions of the game.
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