ΔE 24.7, loose: different enough that you should pick on purpose. Aged Metal is noticeably darker, more muted, warmer than Brass Balls.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Aged Metal is noticeably darker, more muted, warmer than Brass Balls.
The same difference applies the other way round: Brass Balls is noticeably 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 Brass Balls on the colour wheel See Aged Metal on the colour wheel
All matches: Brass Balls equivalents · Aged Metal equivalents