ΔE 11.8, fair: the same colour family, but not a straight swap. Green Ochre is noticeably darker than Zandri Dust.
Can I use Green Ochre instead of Zandri Dust?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Green Ochre is noticeably darker than Zandri Dust.
Can I use Zandri Dust instead of Green Ochre?
The same difference applies the other way round: Zandri Dust is noticeably lighter.
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.