ΔE 7.0, close: similar, with a visible difference side by side. Night Sky is a little lighter, more muted, cooler than Night Blue. They are different kinds of paint: AMMO by Mig Night Blue is an ink, glaze or transparent paint and Army Painter Night Sky 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 7). Night Sky is a little lighter, more muted, cooler than Night Blue. They are different kinds of paint.
The same difference applies the other way round: Night Blue is a little darker, more saturated, 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.
See Night Blue on the colour wheel See Night Sky on the colour wheel
All matches: Night Blue equivalents · Night Sky equivalents