Baal Crimson vs Vermilion

How close are they?

ΔE 9.8, close: similar, with a visible difference side by side. Vermilion is a little darker, more muted than Baal Crimson.

Can I use Vermilion instead of Baal Crimson?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Vermilion is a little darker, more muted than Baal Crimson.

Can I use Baal Crimson instead of Vermilion?

The same difference applies the other way round: Baal Crimson is a little lighter, 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.