Hoard Bronze vs Dark Copper

How close are they?

ΔE 24.6, loose: different enough that you should pick on purpose. Dark Copper is much more muted, warmer than Hoard Bronze.

Can I use Dark Copper instead of Hoard Bronze?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Dark Copper is much more muted, warmer than Hoard Bronze.

Can I use Hoard Bronze instead of Dark Copper?

The same difference applies the other way round: Hoard Bronze 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.