ΔE 6.1, close: similar, with a visible difference side by side. Molten Orange is a little darker, more muted than Earth Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Molten Orange is a little darker, more muted than Earth Brown.
The same difference applies the other way round: Earth Brown 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 Earth Brown on the colour wheel See Molten Orange on the colour wheel
All matches: Earth Brown equivalents · Molten Orange equivalents