ΔE 19.4, loose: different enough that you should pick on purpose. Ancient Copper is noticeably lighter, warmer than Golden Armour.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Ancient Copper is noticeably lighter, warmer than Golden Armour.
The same difference applies the other way round: Golden Armour is noticeably darker, 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 Golden Armour on the colour wheel See Ancient Copper on the colour wheel
All matches: Golden Armour equivalents · Ancient Copper equivalents