ΔE 11.1, fair: the same colour family, but not a straight swap. Dark Mud is more saturated, cooler than Dirt Spatter.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Dark Mud 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 Dark Mud on the colour wheel
All matches: Dirt Spatter equivalents · Dark Mud equivalents