ΔE 15.1, loose: different enough that you should pick on purpose. Ushabti Bone is noticeably darker, cooler than Basic Skin Tone.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Ushabti Bone is noticeably darker, cooler than Basic Skin Tone.
The same difference applies the other way round: Basic Skin Tone is noticeably lighter, 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 Basic Skin Tone on the colour wheel See Ushabti Bone on the colour wheel
All matches: Basic Skin Tone equivalents · Ushabti Bone equivalents