ΔE 18.1, loose: different enough that you should pick on purpose. Desert Brown is a little darker, much more muted, cooler than Radiation Glow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Desert Brown is a little darker, much more muted, cooler than Radiation Glow.
The same difference applies the other way round: Radiation Glow is a little lighter, much more saturated, warmer.
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 Desert Brown on the colour wheel
All matches: Radiation Glow equivalents · Desert Brown equivalents