ΔE 13.8, fair: the same colour family, but not a straight swap. Flak Gun Yellow is noticeably lighter, more saturated than Wasteland Clay.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Flak Gun Yellow is noticeably lighter, more saturated than Wasteland Clay.
The same difference applies the other way round: Wasteland Clay is noticeably darker, 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.
See Wasteland Clay on the colour wheel See Flak Gun Yellow on the colour wheel
All matches: Wasteland Clay equivalents · Flak Gun Yellow equivalents