Slaanesh Grey vs Grey Blue

How close are they?

ΔE 13.6, fair: the same colour family, but not a straight swap. Grey Blue is a little lighter, cooler than Slaanesh Grey.

Can I use Grey Blue instead of Slaanesh Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Grey Blue is a little lighter, cooler than Slaanesh Grey.

Can I use Slaanesh Grey instead of Grey Blue?

The same difference applies the other way round: Slaanesh Grey is a little darker, warmer.

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.