The article isn't completely clear, but it seems as though, in lieu of the higher horsepower engine available outside the US, the 410 US model comes with the carbon fiber bits already included, so the base price is $104,200 (versus $91,900). The weight reduction of 60 Kg allows the US version to equal the performance of the standard 410. However, the base price of the GP edition is $110,000, and it's not clear what the additional $5,800 gets you, if the carbon fiber parts are already included. However, it also says this: "Tipping the scales at just 3,020 lbs (1,370kg), or 2,910 lbs (1,320 kg) with no fuel and lightweight options selected, the Evora Sport 410 for North America has set the benchmark through thorough attention to detail" which seems to suggest that you have to pick the lightweight options, which would obviously increase the price further. Thus, I think as suggested, the 410 US is the 400 with the lightweight parts?