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. 6001541PY43 PR102LF I OpaqueSeries 137 ml tube · 150 ml tube · 8 fl oz can* · 16 fl oz can*About Williamsburg
PR102 Red Ochre / Burnt Sienna1
- Old Holland Classic Oil Colours No. A60PR102LF ISeries A18 ml tube* · 40 ml tube · 60 ml tube* · 125 ml tube · 225 ml tube · 475 ml tin* · 1000 ml tin*About Old Holland
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.