Fluorescent Red vs Fluorescent Orange

How close are they?

ΔE 7.2, close: similar, with a visible difference side by side. Fluorescent Orange is a little lighter than Fluorescent Red.

Can I use Fluorescent Orange instead of Fluorescent Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Fluorescent Orange is a little lighter than Fluorescent Red.

Can I use Fluorescent Red instead of Fluorescent Orange?

The same difference applies the other way round: Fluorescent Red is a little darker.

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.