Page 179:
"Persuasion. When you attempt to influence someone or a group of people with tact, social graces, or good nature, the DM might ask you to make a Charisma (Persuasion) check. Typically, you use persuasion when acting in good faith, to foster friendships, make cordial requests, or exhibit proper etiquette. Examples of persuading others include convincing a chamberlain to let your party see the king, negotiating peace between warring tribes, or inspiring a crowd of townsfolk."
There is discretion and ambiguity here so a DM can justifiably make a ruling either way, they can justifiably treat PCs and NPCs the same or differently under these rules sections of the PH.