Thallax Gold vs Heirloom Gold

How close are they?

ΔE 23.9, loose: different enough that you should pick on purpose. Heirloom Gold is much more muted, warmer than Thallax Gold.

Can I use Heirloom Gold instead of Thallax Gold?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Heirloom Gold is much more muted, warmer than Thallax Gold.

Can I use Thallax Gold instead of Heirloom Gold?

The same difference applies the other way round: Thallax Gold is much more saturated, cooler.

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.