ΔE 15.8, loose: different enough that you should pick on purpose. USAF Light Blue is a little lighter, more muted, cooler than Cobalt Turquois.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). USAF Light Blue is a little lighter, more muted, cooler than Cobalt Turquois.
The same difference applies the other way round: Cobalt Turquois is a little darker, more saturated, 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 Cobalt Turquois on the colour wheel See USAF Light Blue on the colour wheel
All matches: Cobalt Turquois equivalents · USAF Light Blue equivalents