ΔE 29.5, loose: different enough that you should pick on purpose. Galvanic Corrosion is much more muted than Fluorescent Orange.
Can I use Galvanic Corrosion instead of Fluorescent Orange?
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 30). Galvanic Corrosion is much more muted than Fluorescent Orange.
Can I use Fluorescent Orange instead of Galvanic Corrosion?
The same difference applies the other way round: Fluorescent Orange is much more saturated.
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.