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Yes, it is the original theatrical cut on both discs. It states it in tiny red letters on the back of the box. The only version that has the extended 8 minutes (if that's what you're referring to) is the DVD that was released years ago. I don't know if there was a bluray disc that had the extended cut though.
Yes; the Theatrical Cut is on the 4K disc as well as the Blu-Ray.
YES IT IS , Theatrical version on both 4K and Blu-ray Disc.