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