Rootpath vs Burnt Umber Light

How close are they?

ΔE 16.0, loose: different enough that you should pick on purpose. Burnt Umber Light is a little darker, warmer than Rootpath.

Can I use Burnt Umber Light instead of Rootpath?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Burnt Umber Light is a little darker, warmer than Rootpath.

Can I use Rootpath instead of Burnt Umber Light?

The same difference applies the other way round: Rootpath is a little lighter, 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.