ΔE 11.8, fair: the same colour family, but not a straight swap. Huldra Blue is noticeably lighter than Corvus Black.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Huldra Blue is noticeably lighter than Corvus Black.
The same difference applies the other way round: Corvus Black is noticeably darker.
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 Corvus Black on the colour wheel See Huldra Blue on the colour wheel
All matches: Corvus Black equivalents · Huldra Blue equivalents