ΔE 11.2, fair: the same colour family, but not a straight swap. Gold is a little darker, more muted, warmer than Tarnished Brass.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Gold is a little darker, more muted, warmer than Tarnished Brass.
The same difference applies the other way round: Tarnished Brass 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 Tarnished Brass on the colour wheel See Gold on the colour wheel
All matches: Tarnished Brass equivalents · Gold equivalents