Primitivo = Tribidrag / Crljenak Kaštelanski clone found around Puglia, southern Italy.
Zinfandel = Tribidrag / Crljenak Kaštelanski clone that came to California in the 1850s via Austria and New York.

If you want to know the timeline and the differences or want to read my tasting notes, you should take the time to read the main post.
If this is all the information you need, thank you for visiting my blog. Here’s a pretty picture of some Primitivo grapes.

Now go look at the main post; I spent ages on it.

Darren