Burnt Iron vs Brazen Copper

How close are they?

ΔE 26.1, loose: different enough that you should pick on purpose. Brazen Copper is noticeably lighter, much more saturated, cooler than Burnt Iron.

Can I use Brazen Copper instead of Burnt Iron?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Brazen Copper is noticeably lighter, much more saturated, cooler than Burnt Iron.

Can I use Burnt Iron instead of Brazen Copper?

The same difference applies the other way round: Burnt Iron is noticeably darker, much 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.