ΔE 7.6, close: similar, with a visible difference side by side. Night Sky is a little darker, warmer than Ocean Gray (FS35164).
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Night Sky is a little darker, warmer than Ocean Gray (FS35164).
The same difference applies the other way round: Ocean Gray (FS35164) is a little lighter, 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.
See Ocean Gray (FS35164) on the colour wheel See Night Sky on the colour wheel
All matches: Ocean Gray (FS35164) equivalents · Night Sky equivalents