ΔE 8.4, close: similar, with a visible difference side by side. Plate Armour is more muted than Canoptek Alloy.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Plate Armour is more muted than Canoptek Alloy.
The same difference applies the other way round: Canoptek Alloy is 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.
See Canoptek Alloy on the colour wheel See Plate Armour on the colour wheel
All matches: Canoptek Alloy equivalents · Plate Armour equivalents