ΔE 16.4, loose: different enough that you should pick on purpose. Demon Red is noticeably lighter, more muted than Command Red.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Demon Red is noticeably lighter, more muted than Command Red.
The same difference applies the other way round: Command Red is noticeably 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.
See Command Red on the colour wheel See Demon Red on the colour wheel
All matches: Command Red equivalents · Demon Red equivalents