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