Balarama, who has the same original form as Krsna, is Himself a cowherd boy in Vrndavana, and He also considers Himself a member of the ksatriya race in Dvaraka. Thus His color and dress are different, and He is called a pastime form of Krsna

Expressions researched:
"Balarāma, who has the same original form as Kṛṣṇa, is Himself a cowherd boy in Vṛndāvana, and He also considers Himself a member of the kṣatriya race in Dvārakā. Thus His color and dress are different, and He is called a pastime form of Kṛṣṇa"

Sri Caitanya-caritamrta

CC Madhya-lila

“Balarāma, who has the same original form as Kṛṣṇa, is Himself a cowherd boy in Vṛndāvana, and He also considers Himself a member of the kṣatriya race in Dvārakā. Thus His color and dress are different, and He is called a pastime form of Kṛṣṇa."

CC Madhya 20.187, Translation

“Balarāma, who has the same original form as Kṛṣṇa, is Himself a cowherd boy in Vṛndāvana, and He also considers Himself a member of the kṣatriya race in Dvārakā. Thus His color and dress are different, and He is called a pastime form of Kṛṣṇa."