Realistically, there isn’t a direct correlation - central and south america simply don’t come into the original stories (none of the Americas does). Picts combine elements of the early proto-Scots (real world Picts) with a lot of Native American elements. Zingarans would certainly be along the Hispanic lines (but more Spanish/Portuguese rather than Mexican). Zamorians are from far further east - more like Romania/Poland.
This post from Oduda has a fairly decent map (though as she herself points out a few posts further down, it isn’t perfect, but then none of the maps quite match up in every detail)