ΔE 9.4, close: similar, with a visible difference side by side. Pale Sand is a little darker, more saturated, warmer than Buff.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Pale Sand is a little darker, more saturated, warmer than Buff.
The same difference applies the other way round: Buff is a little lighter, more muted, cooler.
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 Buff on the colour wheel See Pale Sand on the colour wheel
All matches: Buff equivalents · Pale Sand equivalents