Oxide Brown Light vs Earth

How close are they?

ΔE 23.4, loose: different enough that you should pick on purpose. Earth is noticeably lighter, more saturated than Oxide Brown Light.

Can I use Earth instead of Oxide Brown Light?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Earth is noticeably lighter, more saturated than Oxide Brown Light.

Can I use Oxide Brown Light instead of Earth?

The same difference applies the other way round: Oxide Brown Light is noticeably darker, more muted.

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.