ΔE 9.0, close: similar, with a visible difference side by side. Pastel Green is a little lighter, warmer than Light Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Pastel Green is a little lighter, warmer than Light Brown.
The same difference applies the other way round: Light Brown is a little darker, cooler.
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 Light Brown on the colour wheel See Pastel Green on the colour wheel
All matches: Light Brown equivalents · Pastel Green equivalents