ΔE 9.4, close: similar, with a visible difference side by side. Gorthor Brown is a little darker, more saturated, warmer than Battle of Marathon.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Gorthor Brown is a little darker, more saturated, warmer than Battle of Marathon.
The same difference applies the other way round: Battle of Marathon is a little lighter, more muted, 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 Battle of Marathon on the colour wheel See Gorthor Brown on the colour wheel
All matches: Battle of Marathon equivalents · Gorthor Brown equivalents