CC Antya-lila 01.067 - Laghu-bha 1.5.461
Sri Caitanya-caritamrta
CC Antya-lila
CC Antya 1.67, Translation and Purport:
""The Kṛṣṇa known as Yadu-kumāra is Vāsudeva Kṛṣṇa. He is different from the Kṛṣṇa who is the son of Nanda Mahārāja. Yadu-kumāra Kṛṣṇa manifests His pastimes in the cities of Mathurā and Dvārakā, but Kṛṣṇa the son of Nanda Mahārāja never at any time leaves Vṛndāvana.""
This verse is included in the Laghu-bhāgavatāmṛta (1.5.461), by Śrīla Rūpa Gosvāmī.