The Kastel Draft Poster that included Billy Dee Williams was never used as a Offical Theatrical Poster
That poster was only a draft poster and never used by Fox/Lucasfilms as a cinema poster
It was used only on the back of the soundtrack album sleeve release
Fox/Lucasfilms created an edited version of Kastel image and was removed from the small number of cinemas that used it and was removed very quickly in May 1980
That's this poster and reason why it was removed in May 1980 is because Billy Dee Williams made a complaint
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A few don't realise that there was 2 posters created with Darth Vader Image
A teaser poster image used in 1979
Coming Soon Poster
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The second poster created was the Official Theatrical Poster used for May 1980 Cinema release
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The next official Theatrical Poster used in Cinemas May 1980
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Outside of a USA cinema May 21st 1980 notice It's Darth Vader Image used
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UK Royal Charity Premiere Odeon Cinema May 20th 1980 is using this
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The 2 Official Theatrical Posters for May 1980 release is these 2
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That is why Zavvi steelbook is using the Darth Vader Poster as it is the Official Theatrical Poster used in May 1980