ΔE 14.5, fair: the same colour family, but not a straight swap. Wild Beast is a little darker, more saturated than Guilliman Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Wild Beast is a little darker, more saturated than Guilliman Flesh.
The same difference applies the other way round: Guilliman Flesh is a little lighter, more muted.
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 Guilliman Flesh on the colour wheel See Wild Beast on the colour wheel
All matches: Guilliman Flesh equivalents · Wild Beast equivalents