Aethermatic Blue vs Blue Glacier

How close are they?

ΔE 6.2, close: similar, with a visible difference side by side. Blue Glacier is cooler than Aethermatic Blue.

Can I use Blue Glacier instead of Aethermatic Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Blue Glacier is cooler than Aethermatic Blue.

Can I use Aethermatic Blue instead of Blue Glacier?

The same difference applies the other way round: Aethermatic Blue is 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.