ΔE 11.2, fair: the same colour family, but not a straight swap. Ancient Copper is more saturated, warmer than Glistening Gold.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Ancient Copper is more saturated, warmer than Glistening Gold.
The same difference applies the other way round: Glistening Gold is more muted, 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 Glistening Gold on the colour wheel See Ancient Copper on the colour wheel
All matches: Glistening Gold equivalents · Ancient Copper equivalents