ΔE 10.6, fair: the same colour family, but not a straight swap. Ushabti Bone is noticeably darker than Cremeweiss.
Can I use Ushabti Bone instead of Cremeweiss?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Ushabti Bone is noticeably darker than Cremeweiss.
Can I use Cremeweiss instead of Ushabti Bone?
The same difference applies the other way round: Cremeweiss is noticeably lighter.
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.