ΔE 3.6, very close: most people won’t see a difference side by side. Our swatches for the two are almost the same. They are different kinds of paint: AMMO by Mig Matt Bluish Black is an ink, glaze or transparent paint and Army Painter Gothic Blue 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). The swatches are almost the same. They are different kinds of paint.
The same difference applies the other way round.
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 Bluish Black on the colour wheel See Gothic Blue on the colour wheel
All matches: Matt Bluish Black equivalents · Gothic Blue equivalents