ΔE 12.1, fair: the same colour family, but not a straight swap. US Light Green is more muted, cooler than Green Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). US Light Green is more muted, cooler than Green Brown.
The same difference applies the other way round: Green Brown is more saturated, 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 Green Brown on the colour wheel See US Light Green on the colour wheel
All matches: Green Brown equivalents · US Light Green equivalents