ΔE 12.2, fair: the same colour family, but not a straight swap. Clear Orange is a little lighter, warmer than C.P. Cadmium Red Dark.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Clear Orange is a little lighter, warmer than C.P. Cadmium Red Dark.
The same difference applies the other way round: C.P. Cadmium Red Dark is a little darker, 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 C.P. Cadmium Red Dark on the colour wheel See Clear Orange on the colour wheel
All matches: C.P. Cadmium Red Dark equivalents · Clear Orange equivalents