Brahmananda das : Prabhupada designed the Krishna and Balarama Deities, the mudra. He made a drawing and gave it to Baradräj to have it made in Jaipur. There is no Krishna Balarama Deity like this with Balarama resting His arm on Krishna’s shoulders. There is no Deity like that, Prabhupada made that design. And then he would joke about it, “Who is stronger, Krishna or Balarama?” Bala means strength, He is the strong one, and everyone would say “Balarama.” Then Prabhupada said, “Then why Balarama is resting on Krishna? This means Krishna is stronger.“
Reference: Following Srila Prabhupada – Remembrances by Yadubara
