ΔE 9.8, close: similar, with a visible difference side by side. Mud Spatter is more muted, warmer than Brown Base FS-30108.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Mud Spatter is more muted, warmer than Brown Base FS-30108.
The same difference applies the other way round: Brown Base FS-30108 is more saturated, 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 Brown Base FS-30108 on the colour wheel See Mud Spatter on the colour wheel
All matches: Brown Base FS-30108 equivalents · Mud Spatter equivalents