What is the difference? It's really very simple. There are three pigments which are not permitted for use in the USA on lips. They are permitted for use on lips in the EU.
This colors are: Ferric Ferrocyanide, Chromium Oxide, and Ultramarine. Unfortunately, these pigments are in all the blue, green and purple tones. For this reason, there are very few permitted blue, green and purple pigments in USA products.
If you are selling a lip product in the USA, you are not permitted by the government to use the color additives permitted only in the EU, so please don't shop there.