ΔE 31.0, loose: different enough that you should pick on purpose. Radiant Yellow is noticeably lighter, much more saturated, cooler than Heirloom Gold.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 31). Radiant Yellow is noticeably lighter, much more saturated, cooler than Heirloom Gold.
The same difference applies the other way round: Heirloom Gold is noticeably darker, much 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 Radiant Yellow on the colour wheel
All matches: Heirloom Gold equivalents · Radiant Yellow equivalents