ΔE 9.6, close: similar, with a visible difference side by side. Sky Blue is a little darker than WWI German Light Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Sky Blue is a little darker than WWI German Light Blue.
The same difference applies the other way round: WWI German Light Blue is a little lighter.
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 WWI German Light Blue on the colour wheel See Sky Blue on the colour wheel
All matches: WWI German Light Blue equivalents · Sky Blue equivalents