"DISM can be used with older Windows image files although it cannot be used with images that are more recent than the installed version of DISM."

So I think my guess was correct. I suspect that DISM gets added to in every version of Windows. And my suggestion probably wouldn't work: I doubt if DISM.exe is a stand-alone executable; it looks complicated enough to require DLLs, which would have to come from Win 11 too.

A Windows 11 installation image, when booted, runs Windows 11, albeit a skeleton version.