ΔE 13.7, fair: the same colour family, but not a straight swap. Polished Gold is noticeably darker, more muted, warmer than Brass Balls.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Polished Gold is noticeably darker, more muted, warmer than Brass Balls.
The same difference applies the other way round: Brass Balls is noticeably 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 Brass Balls on the colour wheel See Polished Gold on the colour wheel
All matches: Brass Balls equivalents · Polished Gold equivalents