ΔE 3.6, very close: most people won’t see a difference side by side. Black is a little darker than Matt Black Primer. They are different kinds of paint: Army Painter Matt Black Primer is a technical paint or medium and Vallejo Black is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 4). Black is a little darker than Matt Black Primer. They are different kinds of paint.
The same difference applies the other way round: Matt Black Primer is a little lighter.
ΔE is the colour difference between our two swatch estimates: under 2 is a perfect match (you’d struggle to tell them apart), under 6 very close, under 10 close, under 15 fair, under 20 loose, under 30 very loose, and 30 or more a poor match. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Matt Black Primer on the colour wheel See Black on the colour wheel
All matches: Matt Black Primer equivalents · Black equivalents