Light Flesh vs Mutant Hue

How close are they?

ΔE 19.6, loose: different enough that you should pick on purpose. Mutant Hue is a little darker, more saturated than Light Flesh.

Can I use Mutant Hue instead of Light Flesh?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Mutant Hue is a little darker, more saturated than Light Flesh.

Can I use Light Flesh instead of Mutant Hue?

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