ΔE 15.8, loose: different enough that you should pick on purpose. Mud Brown is noticeably darker, more muted than Mocca Skin.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Mud Brown is noticeably darker, more muted than Mocca Skin.
The same difference applies the other way round: Mocca Skin is noticeably lighter, more saturated.
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 Mud Brown on the colour wheel
All matches: Mocca Skin equivalents · Mud Brown equivalents