Riky
$MSFT
Man it is hard to you.
Smart Delivery works like that... it downloads the assets specially to the Xbox platform you playing... so if you are downloading on Series X it will download the high quality textures if the game has different texture quality between versions.
When you move the same data do Series S the render engine auto shrink the texture in run-time so the result is the low quality assets of that version. But when you move the downloaded Series S data with lower quality assets to Series X it will need to download and replace the assets.
The fact the downloaded game on Series S has less size than the downloaded game on Series X tells you are just contnue with the same mistakes.
You really aren't that bright, the file size is the same no matter which Series console you download it on, somebody else has also just confirmed that above. Just admit you're wrong.