ΔE 17.7, loose: different enough that you should pick on purpose. Pale Brown is noticeably lighter, more saturated than Mud Brown.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Pale Brown is noticeably lighter, more saturated than Mud Brown.
The same difference applies the other way round: Mud Brown is noticeably darker, 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 Mud Brown on the colour wheel See Pale Brown on the colour wheel
All matches: Mud Brown equivalents · Pale Brown equivalents