but the Fujitsu specific edition may be optimized for certain Fujitsu based laptop/desktop pcs rather than the generic Realtek 11.031.50 driver you mentioned
No, but what Fujitsu did, is combining the Windows 10, Windows 11 drives and the Alll-In-One into one download.
However, they removed several Subsystem IDs and added additional drivers which I cannot judge for the moment where they came from.