Space Dust vs Lilith Yellow

How close are they?

ΔE 9.2, close: similar, with a visible difference side by side. Lilith Yellow is a little darker, more muted than Space Dust.

Can I use Lilith Yellow instead of Space Dust?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Lilith Yellow is a little darker, more muted than Space Dust.

Can I use Space Dust instead of Lilith Yellow?

The same difference applies the other way round: Space Dust is a little lighter, more saturated.

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.