ΔE 11.9, fair: the same colour family, but not a straight swap. IJN Hull Color/Maizuru is a little lighter, more muted than Slaanesh Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). IJN Hull Color/Maizuru is a little lighter, more muted than Slaanesh Grey.
The same difference applies the other way round: Slaanesh Grey 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 Slaanesh Grey on the colour wheel See IJN Hull Color/Maizuru on the colour wheel
All matches: Slaanesh Grey equivalents · IJN Hull Color/Maizuru equivalents