ΔE 9.3, close: similar, with a visible difference side by side. Aged Pewter is a little darker, warmer than Canoptek Alloy.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Aged Pewter is a little darker, warmer than Canoptek Alloy.
The same difference applies the other way round: Canoptek Alloy is a little lighter, cooler.
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 Aged Pewter on the colour wheel
All matches: Canoptek Alloy equivalents · Aged Pewter equivalents