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I've only ever seen the image on the left with a NZ censor stamp (if someone has one without one, let me know - it's on my wants list!). It seems to be a pretty exact copy of the US artwork:I've seen a couple of NZ daybills that have been happy to take on the more graphic horror content whereas the AUS equivalent chooses to soften (or eliminate) the image.
This poster is currently up for auction on Bruce's site as one of fifty daybills in a bulk lot. The consignor seems to be from New Zealand judging by N.Z. censorship ratings appearing on the majority of the posters. Although printed by M.A.P.S. here in Australia it appears that this version of Ruby, without Roadshow printed on it, was for New Zealand only. All previous copies sighted have the New Zealand censorship stamp applied to the poster so I believe backs up our thoughts that this occured .