ΔE 10.6, fair: the same colour family, but not a straight swap. Olive Shadow is more saturated, cooler than Mud Spatter.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Olive Shadow is more saturated, cooler than Mud Spatter.
The same difference applies the other way round: Mud 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 Mud Spatter on the colour wheel See Olive Shadow on the colour wheel
All matches: Mud Spatter equivalents · Olive Shadow equivalents