True Copper vs Copper Fire

How close are they?

ΔE 24.6, loose: different enough that you should pick on purpose. Copper Fire is noticeably lighter, more saturated, cooler than True Copper.

Can I use Copper Fire instead of True Copper?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Copper Fire is noticeably lighter, more saturated, cooler than True Copper.

Can I use True Copper instead of Copper Fire?

The same difference applies the other way round: True Copper is noticeably darker, 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.