ΔE 7.3, close: similar, with a visible difference side by side. Oxide Brown Medium is more saturated, cooler than Dirt Spatter.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Oxide Brown Medium is more saturated, cooler than Dirt Spatter.
The same difference applies the other way round: Dirt Spatter is more muted, 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 Dirt Spatter on the colour wheel See Oxide Brown Medium on the colour wheel
All matches: Dirt Spatter equivalents · Oxide Brown Medium equivalents