ΔE 8.8, close: similar, with a visible difference side by side. Plague Brown is a little darker, more muted than Arylide Yellow Deep.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Plague Brown is a little darker, more muted than Arylide Yellow Deep.
The same difference applies the other way round: Arylide Yellow Deep is a little 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 Arylide Yellow Deep on the colour wheel See Plague Brown on the colour wheel
All matches: Arylide Yellow Deep equivalents · Plague Brown equivalents