ΔE 23.9, loose: different enough that you should pick on purpose. Top Brass is noticeably lighter, much more muted, warmer than Bright Gold.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Top Brass is noticeably lighter, much more muted, warmer than Bright Gold.
The same difference applies the other way round: Bright Gold is noticeably darker, much 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 Bright Gold on the colour wheel See Top Brass on the colour wheel
All matches: Bright Gold equivalents · Top Brass equivalents