ΔE 13.2, fair: the same colour family, but not a straight swap. Golden Brown is much more muted, warmer than Dark Mud.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Golden Brown is much more muted, warmer than Dark Mud.
The same difference applies the other way round: Dark Mud is much 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 Mud on the colour wheel See Golden Brown on the colour wheel
All matches: Dark Mud equivalents · Golden Brown equivalents