ΔE 23.9, loose: different enough that you should pick on purpose. Greenish Gold is noticeably lighter, more saturated, cooler than Heirloom Gold.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Greenish Gold is noticeably lighter, more saturated, cooler than Heirloom Gold.
The same difference applies the other way round: Heirloom Gold is noticeably darker, more muted, warmer.
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 Greenish Gold on the colour wheel
All matches: Heirloom Gold equivalents · Greenish Gold equivalents