ΔE 7.4, close: similar, with a visible difference side by side. Royal Brown is a little darker, more muted than Camo Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Royal Brown is a little darker, more muted than Camo Brown.
The same difference applies the other way round: Camo 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 Camo Brown on the colour wheel See Royal Brown on the colour wheel
All matches: Camo Brown equivalents · Royal Brown equivalents