So the green is a different series that the Copper and the Grey.
Its harder and slicker so I hold up better to abrasion the the copper will over time.
The green is going on parts that cannot be seen like window tracks and the wiper linkage, gears on the inside of the wiper motor. things like that.
After a very long and arduous debate with my son, I talked him out of red for a primary color of the car and he is now going with a matte silver or lighter grey.
And that opened up a lot of choices for the secondary and accent color. Which is where the copper and dark grey came in.