ΔE 23.0, loose: different enough that you should pick on purpose. Aged Metal is a little darker, much more muted, cooler than Brass.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Aged Metal is a little darker, much more muted, cooler than Brass.
The same difference applies the other way round: Brass is a little lighter, much more saturated, warmer.
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 Aged Metal on the colour wheel
All matches: Brass equivalents · Aged Metal equivalents