Krsna is the original Supreme Personality of Godhead, and Vasudeva is the immediate expansion of Krsna. Both Lord Krsna and Baladeva appear as the sons of Vasudeva. BG 1972 purports

Expressions researched:
"Kṛṣṇa is the original Supreme Personality of Godhead, and Vāsudeva is the immediate expansion of Kṛṣṇa. Both Lord Kṛṣṇa and Baladeva appear as the sons of Vasudeva"

Bhagavad-gita As it is

BG Chapters 7 - 12

Kṛṣṇa is the original Supreme Personality of Godhead, and Vāsudeva is the immediate expansion of Kṛṣṇa. Both Lord Kṛṣṇa and Baladeva appear as the sons of Vasudeva. Amongst the sons of Pāṇḍu, Arjuna is famous and valiant. Indeed, he is the best of men and therefore represents Kṛṣṇa.

BG 10.37 (1972), Translation and Purport

Of the descendants of Vṛṣṇi I am Vāsudeva, and of the Pāṇḍavas I am Arjuna. Of the sages I am Vyāsa, and among great thinkers I am Uśanā.

Kṛṣṇa is the original Supreme Personality of Godhead, and Vāsudeva is the immediate expansion of Kṛṣṇa. Both Lord Kṛṣṇa and Baladeva appear as the sons of Vasudeva. Amongst the sons of Pāṇḍu, Arjuna is famous and valiant. Indeed, he is the best of men and therefore represents Kṛṣṇa. Among the munis, or learned men conversant in Vedic knowledge, Vyāsa is the greatest because he explained Vedic knowledge in many different ways for the understanding of the common mass of people in this age of Kali. And Vyāsa is also known as an incarnation of Kṛṣṇa; therefore Vyāsa also represents Kṛṣṇa. Kavis are those who are capable of thinking thoroughly on any subject matter. Among the kavis, Uśanā was the spiritual master of the demons; he was extremely intelligent, far-seeing, political and spiritual in every way. Thus Uśanā is another representative of the opulence of Kṛṣṇa.