ΔE 9.8, close: similar, with a visible difference side by side. Flaming Forge Orange is a little darker than Radiation Glow.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Flaming Forge Orange is a little darker than Radiation Glow.
The same difference applies the other way round: Radiation Glow is a little lighter.
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 Radiation Glow on the colour wheel See Flaming Forge Orange on the colour wheel
All matches: Radiation Glow equivalents · Flaming Forge Orange equivalents