In a PBC you get what is called a Certificate & Statement of Incorporation. This document specifies the name, address, directors/owners and objects of the PBC.
PBC Bylaws are an optional document in a PBC and are equivalent to the Articles of Association in a PLC.
In a PLC you get a Certificate of Incorporation, CR6 (specifies the address of the business), CR14 (specifies the directors of the company) and the Memorandum and Articles of Association (documents that specify the objects of the company, who the shareholders are and govern the relationship of the shareholders in the company).