ΔE 7.7, close: similar, with a visible difference side by side. Sand is more muted, cooler than Earth Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Sand is more muted, cooler than Earth Brown.
The same difference applies the other way round: Earth 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 Earth Brown on the colour wheel See Sand on the colour wheel
All matches: Earth Brown equivalents · Sand equivalents