ΔE 7.4, close: similar, with a visible difference side by side. USN Light Ghost Grey is a little darker, more saturated than Pale Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). USN Light Ghost Grey is a little darker, more saturated than Pale Grey.
The same difference applies the other way round: Pale Grey 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 Pale Grey on the colour wheel See USN Light Ghost Grey on the colour wheel
All matches: Pale Grey equivalents · USN Light Ghost Grey equivalents