Salam,
When a person follows a particular maraja, does he needs to follow the rulings of another maraja in any matter. For instance, i follow ayatollah sistani he gives a fatwa that a particular thing is allowed. But another maraja says it isn't haram but ihtiyat mustahib or ihtiyat wajib or lets say if it is haram. In that case what should a person do.
There are dozens of maraja and its impossible to follow rulings of everyone,