Ushabti Bone vs Elven Flesh

How close are they?

ΔE 15.7, loose: different enough that you should pick on purpose. Elven Flesh is noticeably lighter, more saturated, warmer than Ushabti Bone.

Can I use Elven Flesh instead of Ushabti Bone?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Elven Flesh is noticeably lighter, more saturated, warmer than Ushabti Bone.

Can I use Ushabti Bone instead of Elven Flesh?

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