WWI German Mauve vs Slaanesh Grey

How close are they?

ΔE 10.3, fair: the same colour family, but not a straight swap. Slaanesh Grey is a little lighter, cooler than WWI German Mauve.

Can I use Slaanesh Grey instead of WWI German Mauve?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Slaanesh Grey is a little lighter, cooler than WWI German Mauve.

Can I use WWI German Mauve instead of Slaanesh Grey?

The same difference applies the other way round: WWI German Mauve 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.