Beren has posted a very interesting article on this subject The Children of Hurin facts and figures , which seems to agree in most matters with this thread. However, the main difference appears to be US Deluxe Editions with bookplates with Beren's article stating that these were sold in NY.

However, it appears that the US Deluxe copy has still not been seen in the wild.

So I have two questions, does anyone yet have a US Deluxe Copy and if not were UK Deluxe Copies sold in New York?