ΔE 12.6, fair: the same colour family, but not a straight swap. Cosmic Dust is a little lighter, more muted than Faded Yellow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Cosmic Dust is a little lighter, more muted than Faded Yellow.
The same difference applies the other way round: Faded Yellow is a little darker, 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.
See Faded Yellow on the colour wheel See Cosmic Dust on the colour wheel
All matches: Faded Yellow equivalents · Cosmic Dust equivalents