ΔE 10.7, fair: the same colour family, but not a straight swap. Mud Spatter is a little darker, more muted, warmer than Dark Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Mud Spatter is a little darker, more muted, warmer than Dark Brown.
The same difference applies the other way round: Dark Brown is a little lighter, 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 Dark Brown on the colour wheel See Mud Spatter on the colour wheel
All matches: Dark Brown equivalents · Mud Spatter equivalents