ΔE 7.4, close: similar, with a visible difference side by side. Brown Green is a little lighter, more muted, cooler than Burnt Sand.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Brown Green is a little lighter, more muted, cooler than Burnt Sand.
The same difference applies the other way round: Burnt Sand is a little darker, 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 Burnt Sand on the colour wheel See Brown Green on the colour wheel
All matches: Burnt Sand equivalents · Brown Green equivalents