ΔE 11.7, fair: the same colour family, but not a straight swap. Flat Yellow is a little lighter, cooler than Skulker Yellow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Flat Yellow is a little lighter, cooler than Skulker Yellow.
The same difference applies the other way round: Skulker Yellow is a little darker, warmer.
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 Skulker Yellow on the colour wheel See Flat Yellow on the colour wheel
All matches: Skulker Yellow equivalents · Flat Yellow equivalents