ΔE 5.6, very close: most people won’t see a difference side by side. Light Brown is more muted than Orange Tone. They are different kinds of paint: Army Painter Orange Tone is a wash/shade and Green Stuff World Light Brown is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 6). Light Brown is more muted than Orange Tone. They are different kinds of paint.
The same difference applies the other way round: Orange Tone is 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 Orange Tone on the colour wheel See Light Brown on the colour wheel
All matches: Orange Tone equivalents · Light Brown equivalents