The Catherine Miles Story and Natura Contro have both been released in Europe as Cannibal Holocaust 2, and Bruno Mattei's Mondo Cannibale and Land of Death have been released in Japan as Cannibal Holocaust 2: The Beginning & Cannibal Holocaust 3 respectively.
All are less than watchable, though Mondo Cannibale is notable for reprising the famous line "I wonder who the real cannibals are?" and a surprising real animal killing.
Having said that I have yet to watch my copy of Land of Death, which is unfortunately said to also feature at least one genuine animal slaughter.
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