No, they are distinct but related rituals often performed together during Shradh.
Tarpan: Offering water (with sesame seeds) to quench the thirst and provide satisfaction (Trupti) to ancestors.
Pind Daan: Offering Pindas (food balls made of rice/barley flour) to provide nourishment and substance to ancestors in the Pitru Loka.
Tarpan usually precedes Pind Daan in a Shradh ceremony performed in Haridwar.
