ΔE 6.8, close: similar, with a visible difference side by side. USAF Light Gray is a little darker than Pallid Wych Flesh.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). USAF Light Gray is a little darker than Pallid Wych Flesh.
The same difference applies the other way round: Pallid Wych Flesh is a little lighter.
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 Pallid Wych Flesh on the colour wheel See USAF Light Gray on the colour wheel
All matches: Pallid Wych Flesh equivalents · USAF Light Gray equivalents