ΔE 6.3, close: similar, with a visible difference side by side. Shark White is more saturated than Navy Grey. They are different kinds of paint: AMMO by Mig Navy Grey is an ink, glaze or transparent paint and Army Painter Shark White is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Shark White is more saturated than Navy Grey. They are different kinds of paint.
The same difference applies the other way round: Navy Grey is more muted.
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 Navy Grey on the colour wheel See Shark White on the colour wheel
All matches: Navy Grey equivalents · Shark White equivalents