ΔE 6.3, close: similar, with a visible difference side by side. Light Blue is a little lighter, cooler than RAF Sky / FS 34424.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Light Blue is a little lighter, cooler than RAF Sky / FS 34424.
The same difference applies the other way round: RAF Sky / FS 34424 is a little darker, 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 RAF Sky / FS 34424 on the colour wheel See Light Blue on the colour wheel
All matches: RAF Sky / FS 34424 equivalents · Light Blue equivalents