ΔE 11.2, fair: the same colour family, but not a straight swap. Wraithbone is noticeably darker, cooler than Matt Beige. They are different kinds of paint: AMMO by Mig Matt Beige is an ink, glaze or transparent paint and Citadel Wraithbone is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Wraithbone is noticeably darker, cooler than Matt Beige. They are different kinds of paint.
The same difference applies the other way round: Matt Beige is noticeably lighter, 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 Beige on the colour wheel See Wraithbone on the colour wheel
All matches: Matt Beige equivalents · Wraithbone equivalents