ΔE 19.1, loose: different enough that you should pick on purpose. Undead Skintone is more saturated, cooler than Mocca Skin.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Undead Skintone is more saturated, cooler than Mocca Skin.
The same difference applies the other way round: Mocca Skin is more muted, 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.
See Mocca Skin on the colour wheel See Undead Skintone on the colour wheel
All matches: Mocca Skin equivalents · Undead Skintone equivalents