ΔE 21.2, loose: different enough that you should pick on purpose. Papyrus is noticeably darker, more saturated, warmer than Ratling Grime.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Papyrus is noticeably darker, more saturated, warmer than Ratling Grime.
The same difference applies the other way round: Ratling Grime is noticeably lighter, more muted, 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.
See Ratling Grime on the colour wheel See Papyrus on the colour wheel
All matches: Ratling Grime equivalents · Papyrus equivalents