Did Sai Baba treat the rich and the poor differently when asking for offerings?

No, Sai Baba treated everyone with equality, regardless of their wealth or social standing. The narrative in Chapter 14 explicitly states that "Whether a great wealthy person or a beggar, poor, weak, or destitute—Sai did not know one as less or one as more." He would ask for Dakshina from anyone who came for His darshan, be they Hindu, Muslim, or Parsi. In fact, He often used the practice of Dakshina to dissolve the distinctions of wealth by commanding the rich to humbly go and beg from the poor on His behalf, reinforcing the lesson that all were equal in His eyes.