Plate Mail Metal vs Sparkle Motion

How close are they?

ΔE 6.2, close: similar, with a visible difference side by side. Sparkle Motion is a little darker than Plate Mail Metal.

Can I use Sparkle Motion instead of Plate Mail Metal?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Sparkle Motion is a little darker than Plate Mail Metal.

Can I use Plate Mail Metal instead of Sparkle Motion?

The same difference applies the other way round: Plate Mail Metal is a little lighter.

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.