ΔE 25.4, loose: different enough that you should pick on purpose. Arylide Yellow Deep is noticeably darker, more muted, warmer than Flash Gitz Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Arylide Yellow Deep is noticeably darker, more muted, warmer than Flash Gitz Yellow.
The same difference applies the other way round: Flash Gitz Yellow is noticeably lighter, more saturated, cooler.
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 Flash Gitz Yellow on the colour wheel See Arylide Yellow Deep on the colour wheel
All matches: Flash Gitz Yellow equivalents · Arylide Yellow Deep equivalents