Out of curiosity (and ignorance)……

Has the “Aachamana mantram” been different for each yugam? Wondering so because, in the mantram that we chant, i believe the “Tirunamams” like “Govindaya, Kesavaya, Madhavaya, Madhusoodhana, Damodharaya” etc. epitomize Sri Krishna avataram, arising from HIS cheshtithams” in dwapara yugam.

Kindly pardon if there’s anything wrong in the question. I have complete belief in Shaastram and sampradhayam. Pondering over such trivial questions help strengthen our belief in our systems and also enjoy the true meaning and purpose.

Thank you