ΔE 5.5, very close: most people won’t see a difference side by side. Light Brown is a little darker, cooler than Tan (USAF).
Yes, for most jobs. Very close match (ΔE 6). Light Brown is a little darker, cooler than Tan (USAF).
The same difference applies the other way round: Tan (USAF) is a little lighter, 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 Tan (USAF) on the colour wheel See Light Brown on the colour wheel
All matches: Tan (USAF) equivalents · Light Brown equivalents