ΔE 7.2, close: similar, with a visible difference side by side. Light Brown is a little lighter, more saturated, cooler than Nº13 Desert Sand (FS30279).
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Light Brown is a little lighter, more saturated, cooler than Nº13 Desert Sand (FS30279).
The same difference applies the other way round: Nº13 Desert Sand (FS30279) is a little darker, more muted, warmer.
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 Nº13 Desert Sand (FS30279) on the colour wheel See Light Brown on the colour wheel
All matches: Nº13 Desert Sand (FS30279) equivalents · Light Brown equivalents