ΔE 6.4, close: similar, with a visible difference side by side. Guilliman Flesh is a little lighter, cooler than Matt Dwarf Flesh. They are different kinds of paint: AMMO by Mig Matt Dwarf Flesh is an ink, glaze or transparent paint and Citadel Guilliman Flesh is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Guilliman Flesh is a little lighter, cooler than Matt Dwarf Flesh. They are different kinds of paint.
The same difference applies the other way round: Matt Dwarf Flesh is a little darker, warmer.
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 Dwarf Flesh on the colour wheel See Guilliman Flesh on the colour wheel
All matches: Matt Dwarf Flesh equivalents · Guilliman Flesh equivalents