ΔE 14.0, fair: the same colour family, but not a straight swap. USAF Brown is a little darker, more saturated than Ravenskill.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). USAF Brown is a little darker, more saturated than Ravenskill.
The same difference applies the other way round: Ravenskill is a little lighter, 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 Ravenskill on the colour wheel See USAF Brown on the colour wheel
All matches: Ravenskill equivalents · USAF Brown equivalents