ΔE 9.5, close: similar, with a visible difference side by side. Pallid Wych Flesh is a little lighter, more saturated than Longbeard Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Pallid Wych Flesh is a little lighter, more saturated than Longbeard Grey.
The same difference applies the other way round: Longbeard Grey is a little darker, 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 Longbeard Grey on the colour wheel See Pallid Wych Flesh on the colour wheel
All matches: Longbeard Grey equivalents · Pallid Wych Flesh equivalents