ΔE 12.4, fair: the same colour family, but not a straight swap. Buff is a little darker, more saturated, warmer than Ushabti Bone.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Buff is a little darker, more saturated, warmer than Ushabti Bone.
The same difference applies the other way round: Ushabti Bone 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 Ushabti Bone on the colour wheel See Buff on the colour wheel
All matches: Ushabti Bone equivalents · Buff equivalents