ΔE 13.0, fair: the same colour family, but not a straight swap. Copper Coin is noticeably darker, cooler than Weapon Bronze.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Copper Coin is noticeably darker, cooler than Weapon Bronze.
The same difference applies the other way round: Weapon Bronze is noticeably lighter, 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 Weapon Bronze on the colour wheel See Copper Coin on the colour wheel
All matches: Weapon Bronze equivalents · Copper Coin equivalents