Basilisk Red vs Redwood Brown

How close are they?

ΔE 19.2, loose: different enough that you should pick on purpose. Redwood Brown is noticeably darker, warmer than Basilisk Red.

Can I use Redwood Brown instead of Basilisk Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Redwood Brown is noticeably darker, warmer than Basilisk Red.

Can I use Basilisk Red instead of Redwood Brown?

The same difference applies the other way round: Basilisk Red is noticeably lighter, 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.