ΔE 7.2, close: similar, with a visible difference side by side. Charred Brown is cooler than Burnt Umber Light.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Charred Brown is cooler than Burnt Umber Light.
The same difference applies the other way round: Burnt Umber Light is 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 Burnt Umber Light on the colour wheel See Charred Brown on the colour wheel
All matches: Burnt Umber Light equivalents · Charred Brown equivalents