ΔE 3.4, 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: Pro Acryl Primer Black Brown is a technical paint or medium and Vallejo Muddy Ground is a one-coat contrast-style 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 3). 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 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 Primer Black Brown on the colour wheel See Muddy Ground on the colour wheel
All matches: Primer Black Brown equivalents · Muddy Ground equivalents