ΔE 24.0, loose: different enough that you should pick on purpose. Purple People Eater is a little darker, much more saturated, warmer than Thunderous Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Purple People Eater is a little darker, much more saturated, warmer than Thunderous Blue.
The same difference applies the other way round: Thunderous Blue is a little lighter, much more muted, cooler.
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 Thunderous Blue on the colour wheel See Purple People Eater on the colour wheel
All matches: Thunderous Blue equivalents · Purple People Eater equivalents