[link to original on tumblr]
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So I just checked the liner notes of The Decca Stereo Anthology (which I'm actually currently listening to) and discovered that I'd forgotten (again!) that the single version was recorded on 27 August 1965. I'd neglected to include this in the list of (mostly Decca-era) recording dates too.
After sussing out that chronology, everything makes sense now. I've updated that list of recording dates, and hopefully I won't forget that the soundtrack version pre-dates the single version.
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*The Zombie Heaven liner notes list 2 March 1965 as the recording date, but The Decca Stereo Anthology corrects this to 27 August 1965.