ΔE 9.3, close: similar, with a visible difference side by side. Green Brown is cooler than Russian Sand 7K.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Green Brown is cooler than Russian Sand 7K.
The same difference applies the other way round: Russian Sand 7K is 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 Russian Sand 7K on the colour wheel See Green Brown on the colour wheel
All matches: Russian Sand 7K equivalents · Green Brown equivalents