ΔE 12.7, fair: the same colour family, but not a straight swap. Longbeard Grey is a little lighter, more muted than RAF Camouflage Beige (Hemp) BS381C/389.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Longbeard Grey is a little lighter, more muted than RAF Camouflage Beige (Hemp) BS381C/389.
The same difference applies the other way round: RAF Camouflage Beige (Hemp) BS381C/389 is a little darker, more saturated.
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 RAF Camouflage Beige (Hemp) BS381C/389 on the colour wheel See Longbeard Grey on the colour wheel
All matches: RAF Camouflage Beige (Hemp) BS381C/389 equivalents · Longbeard Grey equivalents