At every TAWAF we have to say diffrent doas
All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
Supplicating is desirable during Tawaf but it is not an obligation. Also, it is desirable for a person performing Tawaf to supplicate with any legislated supplication and there is no difference in this regard between one round and another.
So, it is not an obligation to say a given supplication in every round of the rounds of Tawaaf. Ibn ‘Uthaymeen said: “It is not reported from the Prophet during Tawaf that he used to say a specific supplication in every round (of the rounds of Tawaf).”
Furthermore, Ibn Taymiyyah said: “There is no specific mention of Allah in Tawaf that was reported from the Prophet ; he did not order this, say this or teach this; rather, he used to say any of the legislated supplications in Tawaf.”
Allah Knows best.
Fatwa answered by: The Fatwa Center at Islamweb