Rosy Skin vs Cadian Fleshtone

How close are they?

ΔE 15.7, loose: different enough that you should pick on purpose. Cadian Fleshtone is noticeably darker, more muted, warmer than Rosy Skin.

Can I use Cadian Fleshtone instead of Rosy Skin?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Cadian Fleshtone is noticeably darker, more muted, warmer than Rosy Skin.

Can I use Rosy Skin instead of Cadian Fleshtone?

The same difference applies the other way round: Rosy Skin 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.