From Chunky's point of view, any yellow or green that HE decided to paint on his cars automatically became "Lotus" colors.
As far as variations among the national racing colors, BRG had the most variety over the decades, although there are several French Blues. The Italians seem to be the most consistent along with perhaps, the Germans. Not much variety in the American white either.
BTW, several online sources claim that the yellow is Norfolk Mustard Yellow, the green is simply called BRG.
One source says the the green is Pantone 342 and the yellow is Pantone 142, but I am going to have to go down to a shop with a Pantone book as opposed to a computer screen for true colors.