Sky Blue vs Temple Guard Blue

How close are they?

ΔE 8.6, close: similar, with a visible difference side by side. Temple Guard Blue is a little darker, cooler than Sky Blue.

Can I use Temple Guard Blue instead of Sky Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Temple Guard Blue is a little darker, cooler than Sky Blue.

Can I use Sky Blue instead of Temple Guard Blue?

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