What's the difference between Windows 10 version 2004 and version 21h1?
Summary. Windows 10, versions 2004, 20H2, and 21H1 share a common core operating system with an identical set of system files. Therefore, the new features in Windows 10, version 21H1 are included in the latest monthly quality update for Windows 10, version 2004 and Windows 10, version 20H1, but are in an inactive and dormant state.
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