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I'm probably about 30 years out of date on this (and many other things) but there's a discussion in The Falcons of the World (Cade) about whether New Zealand Falcon should be grouped with beasts like Aplomado Falcon, rather than more obvious grouping with Brown Falcon.
I see HBW refers to both possibilities- happy to oblige with a scan if this thread is not visited by someone who knows what's what.