ΔE 17.9, loose: different enough that you should pick on purpose. Old Copper is noticeably darker, warmer than Brass Scorpion.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Old Copper is noticeably darker, warmer than Brass Scorpion.
The same difference applies the other way round: Brass Scorpion 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 Brass Scorpion on the colour wheel See Old Copper on the colour wheel
All matches: Brass Scorpion equivalents · Old Copper equivalents