ΔE 19.8, loose: different enough that you should pick on purpose. Brass is noticeably darker, warmer than Rusty Gold.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Brass is noticeably darker, warmer than Rusty Gold.
The same difference applies the other way round: Rusty Gold is noticeably lighter, 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 Rusty Gold on the colour wheel See Brass on the colour wheel
All matches: Rusty Gold equivalents · Brass equivalents