Dark Copper vs

How close are they?

ΔE 16.7, loose: different enough that you should pick on purpose. is noticeably lighter, much more muted than Dark Copper.

Can I use instead of Dark Copper?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). is noticeably lighter, much more muted than Dark Copper.

Can I use Dark Copper instead of ?

The same difference applies the other way round: Dark Copper is noticeably darker, much more saturated.

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.