ΔE 10.0, close: similar, with a visible difference side by side. Vermilion is a little lighter, more muted than Command Red.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Vermilion is a little lighter, more muted than Command Red.
The same difference applies the other way round: Command Red is a little 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 Vermilion on the colour wheel
All matches: Command Red equivalents · Vermilion equivalents