ΔE 7.2, close: similar, with a visible difference side by side. Night Blue is a little darker, more saturated than Satin Black.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Night Blue is a little darker, more saturated than Satin Black.
The same difference applies the other way round: Satin Black is a little lighter, 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 Satin Black on the colour wheel See Night Blue on the colour wheel
All matches: Satin Black equivalents · Night Blue equivalents