Windows subsystem weirdness

I looked into registry entry managing subsystem codes. Like native 1 GUI 2 CUI 3.
It is here HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\SubSystems\Windows
And it defines subsystem code 4.
Skipped here
It looks like special subsystem for SxS DLLs (yes, you are not blind). So I want to ask what makes difference between SxS DLL and normal DLL.
SxS DLLs have metatdata that describes them, and they're packaged to work with the Side by Side infrastructure.

A DLL is just a DLL.
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