Sky vs Insignia White

How close are they?

ΔE 9.8, close: similar, with a visible difference side by side. Insignia White is a little darker, more muted, warmer than Sky.

Can I use Insignia White instead of Sky?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Insignia White is a little darker, more muted, warmer than Sky.

Can I use Sky instead of Insignia White?

The same difference applies the other way round: Sky is a little lighter, 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.