ΔE 10.4, fair: the same colour family, but not a straight swap. Tainted Gold is a little lighter, cooler than Brass.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Tainted Gold is a little lighter, cooler than Brass.
The same difference applies the other way round: Brass is a little darker, 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 Brass on the colour wheel See Tainted Gold on the colour wheel
All matches: Brass equivalents · Tainted Gold equivalents