ΔE 11.1, fair: the same colour family, but not a straight swap. Balthasar Gold is more muted, cooler than Rusty Brass.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Balthasar Gold is more muted, cooler than Rusty Brass.
The same difference applies the other way round: Rusty Brass 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 Rusty Brass on the colour wheel See Balthasar Gold on the colour wheel
All matches: Rusty Brass equivalents · Balthasar Gold equivalents