Fluorescent Orange vs Orange Fluor

How close are they?

ΔE 9.2, close: similar, with a visible difference side by side. Orange Fluor is more saturated than Fluorescent Orange.

Can I use Orange Fluor instead of Fluorescent Orange?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Orange Fluor is more saturated than Fluorescent Orange.

Can I use Fluorescent Orange instead of Orange Fluor?

The same difference applies the other way round: Fluorescent Orange is 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.