The P-38 seems to be a fully american version, with superchargers and counter-rotating props. (theres a 3D renderer picture of it somewhere, which shows it isn't what the french ordered)
French wanted to have their P-38s without superchargers and with two right rotating props, instead of counter rotating.
However the buyer wasn't after all able to receive those and went for the brits instead. Only small amount of the british P-38's were without superchargers and right rotating props, since the order was quickly changed to normal outfit. As I recall the few gimp P-38's were also upgraded.