Burnt Umber Light vs Flat Earth

How close are they?

ΔE 6.8, close: similar, with a visible difference side by side. Flat Earth is more muted, warmer than Burnt Umber Light.

Can I use Flat Earth instead of Burnt Umber Light?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Flat Earth is more muted, warmer than Burnt Umber Light.

Can I use Burnt Umber Light instead of Flat Earth?

The same difference applies the other way round: Burnt Umber Light is more saturated, cooler.

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.