ΔE 6.5, close: similar, with a visible difference side by side. Nocturna Shadow is more saturated than Neutral Gray.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Nocturna Shadow is more saturated than Neutral Gray.
The same difference applies the other way round: Neutral Gray 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 Neutral Gray on the colour wheel See Nocturna Shadow on the colour wheel
All matches: Neutral Gray equivalents · Nocturna Shadow equivalents