(Kadamba Kanana Swami, 10 August 2014, Czech, Balarama Jayanti, Srimad Bhagavatam 10.1.8)
Balarama and Krsna are the same but there are differences also. The principle difference is that Balarama is the Supreme Lord in the mood of serving Krsna, ekale īśvara kṛṣṇa, āra saba bhṛtya yāre yaiche nācāya, se taiche karenṛtya (Caitanya Caritamrta Adi 5.142), there is one Supreme Lord Krsna and all others are serving him, including expansions of the Lord, including Lord Balarama. So Krsna is known as sevya bhagavan and Balarama is known as sevak Bhagavan, or Krsna is the Lord who is being served and Balarama is the Lord who is serving. Balarama serves Krsna in many possible ways.
He expands himself as Ananta who has many, many mouths and with all these mouths, he glorifies Krsna. It is said that if you want glorify Krsna, you have to pray to Ananta because it is said that the mouth of Ananta is the jewel-case of the jewel of glorification of Krsna so in this way, Balarama is always serving Krsna by glorifying him. Adi-guru, Balarama is the original spiritual master. One must always glorify Krsna continuously.
Balarama also becomes the bed of the Lord, like Ananta Sesa, he becomes the seat of the Lord and all the utensils of the Lord – his shoes, his plate, his cup, musical instruments are all Balarama. Balarama even becomes Vrindavan for the pleasure of Krsna. Balarama provides all the pleasure for Krsna’s eternal pastimes.
When it comes to the material world, it is Balarama who expands himself into Maha Vishnu, Kṣīrodakaśāyī Vishnu and Garbhodakasayi Vishnu. In all respects, Balarama is serving Krsna – he is behind everything, behind the spiritual world and behind the material world.