Moon Dust vs Heartfire

How close are they?

ΔE 26.0, loose: different enough that you should pick on purpose. Heartfire is noticeably darker, warmer than Moon Dust.

Can I use Heartfire instead of Moon Dust?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Heartfire is noticeably darker, warmer than Moon Dust.

Can I use Moon Dust instead of Heartfire?

The same difference applies the other way round: Moon Dust is noticeably lighter, 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.