ΔE 10.9, fair: the same colour family, but not a straight swap. Imperial Gold is more muted than Bullion.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Imperial Gold is more muted than Bullion.
The same difference applies the other way round: Bullion is more saturated.
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 Bullion on the colour wheel See Imperial Gold on the colour wheel
All matches: Bullion equivalents · Imperial Gold equivalents