ΔE 8.4, close: similar, with a visible difference side by side. Copper Coin is a little darker than Golden Armour.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Copper Coin is a little darker than Golden Armour.
The same difference applies the other way round: Golden Armour is a little lighter.
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 Golden Armour on the colour wheel See Copper Coin on the colour wheel
All matches: Golden Armour equivalents · Copper Coin equivalents