Necromancer Cloak vs Graphene Gray

How close are they?

ΔE 8.8, close: similar, with a visible difference side by side. Graphene Gray is a little darker than Necromancer Cloak.

Can I use Graphene Gray instead of Necromancer Cloak?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Graphene Gray is a little darker than Necromancer Cloak.

Can I use Necromancer Cloak instead of Graphene Gray?

The same difference applies the other way round: Necromancer Cloak is a little lighter.

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.