ΔE 16.2, loose: different enough that you should pick on purpose. Bright Gold is noticeably darker, more saturated, warmer than Brass.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Bright Gold is noticeably darker, more saturated, warmer than Brass.
The same difference applies the other way round: Brass is noticeably lighter, more muted, 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 on the colour wheel See Bright Gold on the colour wheel
All matches: Brass equivalents · Bright Gold equivalents