ΔE 10.4, fair: the same colour family, but not a straight swap. Imperial Gold is a little lighter than Heirloom Gold.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Imperial Gold is a little lighter than Heirloom Gold.
The same difference applies the other way round: Heirloom Gold is a little darker.
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 Heirloom Gold on the colour wheel See Imperial Gold on the colour wheel
All matches: Heirloom Gold equivalents · Imperial Gold equivalents