ΔE 9.3, close: similar, with a visible difference side by side. Temple Stone is a little lighter, more muted than Monster Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Temple Stone is a little lighter, more muted than Monster Brown.
The same difference applies the other way round: Monster Brown is a little darker, 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 Monster Brown on the colour wheel See Temple Stone on the colour wheel
All matches: Monster Brown equivalents · Temple Stone equivalents