ΔE 18.6, loose: different enough that you should pick on purpose. Flash Gitz Yellow is a little lighter, more saturated, warmer than Vivid Volt.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Flash Gitz Yellow is a little lighter, more saturated, warmer than Vivid Volt.
The same difference applies the other way round: Vivid Volt is a little darker, more muted, 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 Vivid Volt on the colour wheel See Flash Gitz Yellow on the colour wheel
All matches: Vivid Volt equivalents · Flash Gitz Yellow equivalents