ΔE 13.7, fair: the same colour family, but not a straight swap. Flash Gitz Yellow is much more saturated than Pistachio.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Flash Gitz Yellow is much more saturated than Pistachio.
The same difference applies the other way round: Pistachio is 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.
See Pistachio on the colour wheel See Flash Gitz Yellow on the colour wheel
All matches: Pistachio equivalents · Flash Gitz Yellow equivalents