Khardic Flesh vs Light Brown

How close are they?

ΔE 15.9, loose: different enough that you should pick on purpose. Light Brown is noticeably darker, more muted, warmer than Khardic Flesh.

Can I use Light Brown instead of Khardic Flesh?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Light Brown is noticeably darker, more muted, warmer than Khardic Flesh.

Can I use Khardic Flesh instead of Light Brown?

The same difference applies the other way round: Khardic Flesh is noticeably lighter, 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.