Only die hard movie fans would have even noticed in the early days of home video. And it was a lot harder to compare different versions of a film unless you had access to film prints.
I didn’t realize how much ABC censored the Bond films until I saw them uncut on HBO circa 1981.
Super 8 digests of CE3K came out around the same time they did for Star Wars. No idea if there ever was a full length Derann release in the UK.
I don’t think any of those early home video incarnations ever appeared without the Special Edition above the title. Lucasfilm dropped the SE moniker on the OT by the time it appeared on DVD.

I’m sure if I dug into back issues of Starlog or Cinefantastique, I could find a letter or two lamenting the lack of a theatrical CE3K. 😉