ΔE 16.1, loose: different enough that you should pick on purpose. Heavy Metal is noticeably darker, more muted than Canoptek Alloy.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Heavy Metal is noticeably darker, more muted than Canoptek Alloy.
The same difference applies the other way round: Canoptek Alloy is noticeably 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.
See Canoptek Alloy on the colour wheel See Heavy Metal on the colour wheel
All matches: Canoptek Alloy equivalents · Heavy Metal equivalents