ΔE 8.1, close: similar, with a visible difference side by side. Sky BS381C/210 is a little darker, cooler than Grotesque Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Sky BS381C/210 is a little darker, cooler than Grotesque Green.
The same difference applies the other way round: Grotesque Green is a little lighter, warmer.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Grotesque Green on the colour wheel See Sky BS381C/210 on the colour wheel
All matches: Grotesque Green equivalents · Sky BS381C/210 equivalents