ΔE 8.6, close: similar, with a visible difference side by side. Nuclear Yellow is more muted than Fire Giant Orange.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Nuclear Yellow is more muted than Fire Giant Orange.
The same difference applies the other way round: Fire Giant Orange is 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.
See Fire Giant Orange on the colour wheel See Nuclear Yellow on the colour wheel
All matches: Fire Giant Orange equivalents · Nuclear Yellow equivalents