ΔE 10.1, fair: the same colour family, but not a straight swap. Barley Gray BS4800/18B21 is more muted, cooler than Light Feldgrau.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Barley Gray BS4800/18B21 is more muted, cooler than Light Feldgrau.
The same difference applies the other way round: Light Feldgrau is more saturated, 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 Light Feldgrau on the colour wheel See Barley Gray BS4800/18B21 on the colour wheel
All matches: Light Feldgrau equivalents · Barley Gray BS4800/18B21 equivalents