ΔE 11.8, fair: the same colour family, but not a straight swap. Moon Dust is noticeably lighter than Medium German Yellow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Moon Dust is noticeably lighter than Medium German Yellow.
The same difference applies the other way round: Medium German Yellow is noticeably darker.
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.
See Medium German Yellow on the colour wheel See Moon Dust on the colour wheel
All matches: Medium German Yellow equivalents · Moon Dust equivalents