ΔE 11.3, fair: the same colour family, but not a straight swap. Brass is a little darker, more muted, warmer than Emperor Gold.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Brass is a little darker, more muted, warmer than Emperor Gold.
The same difference applies the other way round: Emperor Gold is a little 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 Emperor Gold on the colour wheel See Brass on the colour wheel
All matches: Emperor Gold equivalents · Brass equivalents