Ushabti Bone vs Lilith Yellow

How close are they?

ΔE 20.2, loose: different enough that you should pick on purpose. Lilith Yellow is a little lighter, much more saturated than Ushabti Bone.

Can I use Lilith Yellow instead of Ushabti Bone?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Lilith Yellow is a little lighter, much more saturated than Ushabti Bone.

Can I use Ushabti Bone instead of Lilith Yellow?

The same difference applies the other way round: Ushabti Bone is a little darker, much more muted.

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.