ΔE 6.6, close: similar, with a visible difference side by side. USN Light Ghost Grey is more saturated than Blackstone Void.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). USN Light Ghost Grey is more saturated than Blackstone Void.
The same difference applies the other way round: Blackstone Void 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 Blackstone Void on the colour wheel See USN Light Ghost Grey on the colour wheel
All matches: Blackstone Void equivalents · USN Light Ghost Grey equivalents