I can’t recall exact details, but the first month saw a few different updates for Series X|S dealing with various Rest/PowerSave modes. Getting a genuine apples to apples comparison in rest mode is quite difficult because either system may or may not be doing additional housekeeping tasks such as downloading updates or applying filesystem cleanups or optimizations etc. The only way to possibly be sure is to have both systems in their official Offline modes via system settings, disconnected from the internet, and in the Rest/Sleep/PowerSave mode for at least 15 minutes.
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