Pana's can be classified into 35 Families. It is said and mostly well known in Satta Matka circles that patterns are based on Pana Families and you can guess pana using line based on pana family.
For Example, If 170 is expected today according to a pattern, it may turn out to be 120 or any pana from the 125 Pana Family. Pana's are only interchangeable within their family of Pana's. Most guessers and players play family Pana's as support.