ΔE 12.2, fair: the same colour family, but not a straight swap. Interference Red (Fine) is more muted than Interference Blue (Fine).
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Interference Red (Fine) is more muted than Interference Blue (Fine).
The same difference applies the other way round: Interference Blue (Fine) is 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 Interference Blue (Fine) on the colour wheel See Interference Red (Fine) on the colour wheel
All matches: Interference Blue (Fine) equivalents · Interference Red (Fine) equivalents