ΔE 11.6, fair: the same colour family, but not a straight swap. Grey Brown is more muted, cooler than Dark Golden Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Grey Brown is more muted, cooler than Dark Golden Brown.
The same difference applies the other way round: Dark Golden Brown is more saturated, 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 Dark Golden Brown on the colour wheel See Grey Brown on the colour wheel
All matches: Dark Golden Brown equivalents · Grey Brown equivalents