ΔE 10.0, fair: the same colour family, but not a straight swap. A-14 Steel Grey is a little lighter than Necromancer Cloak.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). A-14 Steel Grey is a little lighter than Necromancer Cloak.
The same difference applies the other way round: Necromancer Cloak is a little 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 Necromancer Cloak on the colour wheel See A-14 Steel Grey on the colour wheel
All matches: Necromancer Cloak equivalents · A-14 Steel Grey equivalents