ΔE 24.6, loose: different enough that you should pick on purpose. Ushabti Bone is noticeably darker, much more muted, warmer than Pale Rider.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Ushabti Bone is noticeably darker, much more muted, warmer than Pale Rider.
The same difference applies the other way round: Pale Rider is noticeably lighter, much more saturated, 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 Pale Rider on the colour wheel See Ushabti Bone on the colour wheel
All matches: Pale Rider equivalents · Ushabti Bone equivalents