Slaanesh Grey vs Cobalt Violet Grey

How close are they?

ΔE 13.3, fair: the same colour family, but not a straight swap. Cobalt Violet Grey is noticeably darker than Slaanesh Grey.

Can I use Cobalt Violet Grey instead of Slaanesh Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Cobalt Violet Grey is noticeably darker than Slaanesh Grey.

Can I use Slaanesh Grey instead of Cobalt Violet Grey?

The same difference applies the other way round: Slaanesh Grey is noticeably 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.