Burnished Red vs Darkoath Flesh

How close are they?

ΔE 22.5, loose: different enough that you should pick on purpose. Darkoath Flesh is noticeably lighter, more saturated, warmer than Burnished Red.

Can I use Darkoath Flesh instead of Burnished Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Darkoath Flesh is noticeably lighter, more saturated, warmer than Burnished Red.

Can I use Burnished Red instead of Darkoath Flesh?

The same difference applies the other way round: Burnished Red is noticeably darker, more muted, 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.