Red Ecstasy vs Fluorescent Red

How close are they?

ΔE 7.3, close: similar, with a visible difference side by side. Fluorescent Red is a little lighter, more muted than Red Ecstasy.

Can I use Fluorescent Red instead of Red Ecstasy?

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

Can I use Red Ecstasy instead of Fluorescent Red?

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