Khorne Red vs Choco Brown

How close are they?

ΔE 21.0, loose: different enough that you should pick on purpose. Choco Brown is noticeably darker, much more muted, warmer than Khorne Red.

Can I use Choco Brown instead of Khorne Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Choco Brown is noticeably darker, much more muted, warmer than Khorne Red.

Can I use Khorne Red instead of Choco Brown?

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