Incubi Darkness vs Jade

How close are they?

ΔE 8.1, close: similar, with a visible difference side by side. Jade is a little lighter, warmer than Incubi Darkness.

Can I use Jade instead of Incubi Darkness?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Jade is a little lighter, warmer than Incubi Darkness.

Can I use Incubi Darkness instead of Jade?

The same difference applies the other way round: Incubi Darkness is a little darker, 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.