Sky Blue vs UK Azure Blue

How close are they?

ΔE 9.1, close: similar, with a visible difference side by side. UK Azure Blue is more muted, warmer than Sky Blue.

Can I use UK Azure Blue instead of Sky Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). UK Azure Blue is more muted, warmer than Sky Blue.

Can I use Sky Blue instead of UK Azure Blue?

The same difference applies the other way round: Sky Blue is more saturated, 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.