Moon Dust vs Cyber Yellow

How close are they?

ΔE 18.1, loose: different enough that you should pick on purpose. Cyber Yellow is a little darker, much more saturated than Moon Dust.

Can I use Cyber Yellow instead of Moon Dust?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Cyber Yellow is a little darker, much more saturated than Moon Dust.

Can I use Moon Dust instead of Cyber Yellow?

The same difference applies the other way round: Moon Dust is a little lighter, much 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.