Frostveil vs Blue

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. Blue is a little lighter, more saturated than Frostveil.

Can I use Blue instead of Frostveil?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Blue is a little lighter, more saturated than Frostveil.

Can I use Frostveil instead of Blue?

The same difference applies the other way round: Frostveil is a little darker, more muted.

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.