Hashut Copper vs Runic Gold

How close are they?

ΔE 33.1, loose: different enough that you should pick on purpose. Runic Gold is more saturated, cooler than Hashut Copper.

Can I use Runic Gold instead of Hashut Copper?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 33). Runic Gold is more saturated, cooler than Hashut Copper.

Can I use Hashut Copper instead of Runic Gold?

The same difference applies the other way round: Hashut Copper is 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.