Srimad Bhagavatam Canto 10, Chapter 13, Text 38

SB 10.13.38

iti sañcintya dasarho
vatsan sa-vayasan api
sarvan acasta vaikuntham
caksusa vayunena sah
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Thinking in this way, Lord Balarama was able to see, with the eye of transcendental knowledge, that all these calves and Krsna’s friends were expansions of the form of Sri Krsna.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Every individual is different. There are even differences between twin brothers. Yet when Krsna expanded Himself as the boys and calves, each boy and each calf appeared in its own original feature, with the same individual way of acting, the same tendencies, the same color, the same dress, and so on, for Krsna manifested Himself with all these differences. This was Krsna’s opulence.
Srimad Bhagavatam Canto 10, Chapter 13, Text 37
Srimad Bhagavatam Canto 10, Chapter 13, Text 39