Macragge Blue vs Exile Blue

How close are they?

ΔE 8.7, close: similar, with a visible difference side by side. Exile Blue is a little darker, more muted than Macragge Blue.

Can I use Exile Blue instead of Macragge Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Exile Blue is a little darker, more muted than Macragge Blue.

Can I use Macragge Blue instead of Exile Blue?

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

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.