ΔE 12.5, fair: the same colour family, but not a straight swap. Tarnished Brass is more muted, cooler than Golden Armour.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Tarnished Brass is more muted, cooler than Golden Armour.
The same difference applies the other way round: Golden Armour 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 Golden Armour on the colour wheel See Tarnished Brass on the colour wheel
All matches: Golden Armour equivalents · Tarnished Brass equivalents