Not quite sure how to explain it for these orders, but let me try in connection with my own order, the Carmelites. We have a Rule of Life that we follow, which is basically daily Mass, Divine Office am and pm, and half hour of mental prayer, as well as other lesser things.
Each “chapter” has a list of Statutes that the members of that chapter set forth after being drawn up by the members and voted upon. This would include the meeting place and time of day, the amount each will pay for dues, the specifics for professions and the entrance of new members, the regulations concerning the meeting itself, etc.
I trust you will see the difference, and I presume this would be the same distinction in other orders.
