ΔE 17.5, loose: different enough that you should pick on purpose. Khardic Flesh is noticeably darker, more saturated than Rosy Skin.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Khardic Flesh is noticeably darker, more saturated than Rosy Skin.
The same difference applies the other way round: Rosy Skin is noticeably 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.
See Rosy Skin on the colour wheel See Khardic Flesh on the colour wheel
All matches: Rosy Skin equivalents · Khardic Flesh equivalents