Space Yellow vs Zamesi Desert

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. Zamesi Desert is more saturated than Space Yellow.

Can I use Zamesi Desert instead of Space Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Zamesi Desert is more saturated than Space Yellow.

Can I use Space Yellow instead of Zamesi Desert?

The same difference applies the other way round: Space Yellow is 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.