ΔE 13.9, fair: the same colour family, but not a straight swap. IDF Gray 1 (-1981 Sinai) is a little darker, more saturated, warmer than Wraithbone.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). IDF Gray 1 (-1981 Sinai) is a little darker, more saturated, warmer than Wraithbone.
The same difference applies the other way round: Wraithbone is a little lighter, more muted, cooler.
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 Wraithbone on the colour wheel See IDF Gray 1 (-1981 Sinai) on the colour wheel
All matches: Wraithbone equivalents · IDF Gray 1 (-1981 Sinai) equivalents