ΔE 12.0, fair: the same colour family, but not a straight swap. Blue Liner is noticeably darker, more muted than Incubi Darkness.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Blue Liner is noticeably darker, more muted than Incubi Darkness.
The same difference applies the other way round: Incubi Darkness is noticeably 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.
See Incubi Darkness on the colour wheel See Blue Liner on the colour wheel
All matches: Incubi Darkness equivalents · Blue Liner equivalents