ΔE 15.7, loose: different enough that you should pick on purpose. Neptune Glow is a little lighter, more saturated, warmer than Air Superiority Blue FS 35450.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Neptune Glow is a little lighter, more saturated, warmer than Air Superiority Blue FS 35450.
The same difference applies the other way round: Air Superiority Blue FS 35450 is a little darker, more muted, cooler.
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 Air Superiority Blue FS 35450 on the colour wheel See Neptune Glow on the colour wheel
All matches: Air Superiority Blue FS 35450 equivalents · Neptune Glow equivalents