ΔE 5.1, very close: most people won’t see a difference side by side. Heavy Metal is a little darker than Matt Satin Black. They are different kinds of paint: AMMO by Mig Matt Satin Black is an ink, glaze or transparent paint and Army Painter Heavy Metal is a metallic, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 5). Heavy Metal is a little darker than Matt Satin Black. They are different kinds of paint.
The same difference applies the other way round: Matt Satin Black 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.
See Matt Satin Black on the colour wheel See Heavy Metal on the colour wheel
All matches: Matt Satin Black equivalents · Heavy Metal equivalents