ΔE 11.7, fair: the same colour family, but not a straight swap. USAF Light Blue is noticeably darker, cooler than Snow Shadow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). USAF Light Blue is noticeably darker, cooler than Snow Shadow.
The same difference applies the other way round: Snow Shadow is noticeably lighter, warmer.
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 Snow Shadow on the colour wheel See USAF Light Blue on the colour wheel
All matches: Snow Shadow equivalents · USAF Light Blue equivalents