Alec at technology connections goes over it in this video. From what I recall, even though it has a lower gauge wire it won't make much of a difference at the short distances these go.
Here in North America we don't do three phase charging, we only really have single phase and DC charging. Other than the Nissan Leaf, pretty much every recent vehicle with DC fast charging uses CCS Type 1, which is essentially J1772 (a 5-pin AC connector) with two extra DC pins at the bottom. NACS/Tesla basically combines the DC pins with the two AC pins, so the port can be smaller.
From what I understood it was the same plug. Just dispersing different current/voltage. Didn't think it was 2 plugs. Someone with more knowledge may confirm
Sort of, the article states they are following the EU and China as well. Aiming to bring a universal port/plug that will work for business and consumers across all size platforms