Wasteland Soil vs Violet Oxide

How close are they?

ΔE 17.5, loose: different enough that you should pick on purpose. Violet Oxide is a little darker, warmer than Wasteland Soil.

Can I use Violet Oxide instead of Wasteland Soil?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Violet Oxide is a little darker, warmer than Wasteland Soil.

Can I use Wasteland Soil instead of Violet Oxide?

The same difference applies the other way round: Wasteland Soil 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.