Metallic Blue vs Plate Mail Metal

How close are they?

ΔE 24.0, loose: different enough that you should pick on purpose. Plate Mail Metal is a little lighter, much more muted than Metallic Blue.

Can I use Plate Mail Metal instead of Metallic Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Plate Mail Metal is a little lighter, much more muted than Metallic Blue.

Can I use Metallic Blue instead of Plate Mail Metal?

The same difference applies the other way round: Metallic Blue is a little darker, much 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.