ΔE 8.4, close: similar, with a visible difference side by side. Pale Brown is a little lighter, more saturated than Brown Gray.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Pale Brown is a little lighter, more saturated than Brown Gray.
The same difference applies the other way round: Brown Gray 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 Brown Gray on the colour wheel See Pale Brown on the colour wheel
All matches: Brown Gray equivalents · Pale Brown equivalents