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
PR102 Red Ochre / Burnt Sienna + PY43 Yellow Ochre / Raw Sienna1
- Williamsburg Handmade Oil Colors No. 6000042PY43 PR102LF I Semi-opaqueSeries 237 ml tube · 150 ml tube · 8 fl oz can* · 16 fl oz can*About Williamsburg
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.