ΔE 15.9, loose: different enough that you should pick on purpose. Parasite Brown is noticeably darker, more saturated than Pastel Peach.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Parasite Brown is noticeably darker, more saturated than Pastel Peach.
The same difference applies the other way round: Pastel Peach 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 Pastel Peach on the colour wheel See Parasite Brown on the colour wheel
All matches: Pastel Peach equivalents · Parasite Brown equivalents