If my memory serves me right. GA = General Availability MU = Maintainence update Exx = Extended .....
Exx are updated versions of GA/MU which are released to address an upgrade related issue. (They sometimes includes a bundle of already released patches to that version to reduce the number of patches required to enabled afterwards.) That fix is also available as a patch for the users already running that version. In certain versions I've seen difference between an Exx release and an updated MU release. What best comes to mind is 3.2.2 MU4 vs eMU4. With eMU4 there is one component being update to P59 (or was it P57) which doesn't get updated if you simply add that patch on MU4. My guess is that there is something upgrade-only related which requires a node reboot to be activated which is activated with eMU4 but not (and not required) for MU4.
Hope this makes you a little bit smarter and hopefully HPE will become a bit smarter and make versioning more intuitive in the future.
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