Crusted Sore vs Choco Brown

How close are they?

ΔE 22.5, loose: different enough that you should pick on purpose. Choco Brown is noticeably darker, more muted, warmer than Crusted Sore.

Can I use Choco Brown instead of Crusted Sore?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Choco Brown is noticeably darker, more muted, warmer than Crusted Sore.

Can I use Crusted Sore instead of Choco Brown?

The same difference applies the other way round: Crusted Sore is noticeably lighter, more saturated, 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.