2 different recipes. Brands sell different pigment mixtures under this name, so they won't all look or mix alike. Compare the pigments below.
Who makes it
PO20 Cadmium Orange1
- Blockx Extra-Fine Oil Colours No. 212821
PR108 Cadmium Red1
- Maimeri Puro Oil Colours Cadmium Red Orange · No. 224
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.