The original version is definitive - the 30th anniversary release (in the UK at least) added on the aforementioned "burial" footage with the same actor in the role as the opening zombie, but this and other "new" scenes in this version were shot three decades after the original film by co-writer John A Russo and spliced in.
The result was always going to be desperate, with Bill Hinzman looking ridiculous in trying to look 30 years younger as the graveyard-zombie and all the "new" stuff looking and sounding terribly out of place.
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