Raven Black vs Blue Liner

How close are they?

ΔE 8.0, close: similar, with a visible difference side by side. Blue Liner is a little darker, more saturated than Raven Black.

Can I use Blue Liner instead of Raven Black?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Blue Liner is a little darker, more saturated than Raven Black.

Can I use Raven Black instead of Blue Liner?

The same difference applies the other way round: Raven Black is a little lighter, more muted.

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.