Puri for all the three recipes are the same. Only the different stuffing changes the whole dish.
Pani Puri is stuffed with mashed potatoes, a little bit of chili, some boiled channa, and finally, it is dipped and poured with Indian spiced water.
Dahi puri is stuffed with finely chopped boiled potatoes, Sweetened curd or yogurt, Coriander-mint chutney, tamarind-dates chutney. Garnished with nylon sev and chopped onions.
Sev Puri is a dry recipe as compared to Dahi Puri and Pani Puri. It is stuffed with finely chopped boiled potatoes and onions. Coriander-mint chutney, tamarind-dates chutney, chaat masala, some roasted peanuts, some pomegranate seeds, and nylon sev.