ΔE 3.8, very close: most people won’t see a difference side by side. Matt White Primer is a little darker than White. They are different kinds of paint: AK Interactive White is an opaque base/layer paint and Army Painter Matt White Primer is a technical paint or medium, 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). Matt White Primer is a little darker than White. They are different kinds of paint.
The same difference applies the other way round: White 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 White on the colour wheel See Matt White Primer on the colour wheel
All matches: White equivalents · Matt White Primer equivalents