ΔE 10.3, fair: the same colour family, but not a straight swap. Blue Liner is more saturated than Corvus Black.
Can I use Blue Liner instead of Corvus Black?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Blue Liner is more saturated than Corvus Black.
Can I use Corvus Black instead of Blue Liner?
The same difference applies the other way round: Corvus Black is 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.