ΔE 11.8, fair: the same colour family, but not a straight swap. Dark Gray 2 is a little lighter, more muted than Necromancer Cloak.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Dark Gray 2 is a little lighter, more muted than Necromancer Cloak.
The same difference applies the other way round: Necromancer Cloak is a little darker, 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 Necromancer Cloak on the colour wheel See Dark Gray 2 on the colour wheel
All matches: Necromancer Cloak equivalents · Dark Gray 2 equivalents