Night Sky vs Abyss Blue

How close are they?

ΔE 7.8, close: similar, with a visible difference side by side. Abyss Blue is more saturated, warmer than Night Sky.

Can I use Abyss Blue instead of Night Sky?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Abyss Blue is more saturated, warmer than Night Sky.

Can I use Night Sky instead of Abyss Blue?

The same difference applies the other way round: Night Sky is more muted, cooler.

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.