Does the Shafi'i madhhab differ from other madhahib in prayer, Sunnah acts, obligatory duties, and acts of worship? And is what is commonly practiced of the Sunnah acts and obligatory duties valid?

The Shafi'i madhhab is an authentic madhhab among the Sunni madhahib, differing from others in matters of worship, transactions, and ethics. Whoever is capable of knowing the evidence must follow it and not be restricted by what contradicts it. As for one who does not have the competence to know the evidence, there is no blame upon him for following a specific madhhab.