Cardinal Purple vs Charred Brown

How close are they?

ΔE 6.4, close: similar, with a visible difference side by side. Charred Brown is a little lighter, more muted than Cardinal Purple.

Can I use Charred Brown instead of Cardinal Purple?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Charred Brown is a little lighter, more muted than Cardinal Purple.

Can I use Cardinal Purple instead of Charred Brown?

The same difference applies the other way round: Cardinal Purple is a little darker, more saturated.

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.