ΔE 16.0, loose: different enough that you should pick on purpose. USAF Light Blue is a little darker, more saturated than N5 Neutral Gray.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). USAF Light Blue is a little darker, more saturated than N5 Neutral Gray.
The same difference applies the other way round: N5 Neutral Gray 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 N5 Neutral Gray on the colour wheel See USAF Light Blue on the colour wheel
All matches: N5 Neutral Gray equivalents · USAF Light Blue equivalents