Slime Yellow vs Ushabti Bone

How close are they?

ΔE 24.6, loose: different enough that you should pick on purpose. Ushabti Bone is noticeably darker, much more muted, warmer than Slime Yellow.

Can I use Ushabti Bone instead of Slime Yellow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Ushabti Bone is noticeably darker, much more muted, warmer than Slime Yellow.

Can I use Slime Yellow instead of Ushabti Bone?

The same difference applies the other way round: Slime Yellow 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.