ARM vs x86 is part of the equation; ARM uses significantly less power than x86, but has a simplified instruction. x86 consumes more power but is more robust and has higher computing capabilities and higher workload efficiency

The other half of the equation is OS level software that can restrict what is allowed to process during said low power sleep.

In theory nothing stops x86 hardware from having something comparable, but it would probably use a lot more power than you’d expect.

There are ways to make windows and Linux wake at certain times for actions via wake timers which isn’t quite the same, though