Deep Ocean Blue vs Necro Grey

How close are they?

ΔE 10.6, fair: the same colour family, but not a straight swap. Necro Grey is a little lighter, more muted than Deep Ocean Blue.

Can I use Necro Grey instead of Deep Ocean Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Necro Grey is a little lighter, more muted than Deep Ocean Blue.

Can I use Deep Ocean Blue instead of Necro Grey?

The same difference applies the other way round: Deep Ocean Blue 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.