Sycorax Bronze vs Heirloom Gold

How close are they?

ΔE 22.7, loose: different enough that you should pick on purpose. Heirloom Gold is noticeably lighter, cooler than Sycorax Bronze.

Can I use Heirloom Gold instead of Sycorax Bronze?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Heirloom Gold is noticeably lighter, cooler than Sycorax Bronze.

Can I use Sycorax Bronze instead of Heirloom Gold?

The same difference applies the other way round: Sycorax Bronze is noticeably darker, 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.