ΔE 7.9, close: similar, with a visible difference side by side. Dirt is a little lighter, cooler than Gorthor Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Dirt is a little lighter, cooler than Gorthor Brown.
The same difference applies the other way round: Gorthor Brown is a little darker, 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 Gorthor Brown on the colour wheel See Dirt on the colour wheel
All matches: Gorthor Brown equivalents · Dirt equivalents