ΔE 8.6, close: similar, with a visible difference side by side. Canvas is a little darker, cooler than Dark Earth BS381C/450.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Canvas is a little darker, cooler than Dark Earth BS381C/450.
The same difference applies the other way round: Dark Earth BS381C/450 is a little lighter, warmer.
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 Dark Earth BS381C/450 on the colour wheel See Canvas on the colour wheel
All matches: Dark Earth BS381C/450 equivalents · Canvas equivalents