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
PBr11 Magnesium Ferrite Brown + PY37 Cadmium Yellow1
- Holbein Artists' Oil Color No. H232PY37 PBr11 PW6LF I Semi-opaqueSeries AHue20 ml tube · 40 ml tube · 50 ml tube* · 110 ml tube*About Holbein
PBr24 Chrome Titanate Yellow + PY35 Cadmium Yellow1
- Williamsburg Handmade Oil Colors No. 6000461PW6 PBr24 PY35LF I OpaqueSeries 2Hue37 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.