Highlight Flesh vs Morghast Bone

How close are they?

ΔE 16.9, loose: different enough that you should pick on purpose. Morghast Bone is a little darker, more muted, cooler than Highlight Flesh.

Can I use Morghast Bone instead of Highlight Flesh?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Morghast Bone is a little darker, more muted, cooler than Highlight Flesh.

Can I use Highlight Flesh instead of Morghast Bone?

The same difference applies the other way round: Highlight Flesh is a little lighter, more saturated, 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.