What is the distinction between “three disciplines” and the narrower use of “the science of balagha”?

Introduction: Structure, Three Disciplines and Kinds of Preface

• Both always mean exactly the three disciplines
• The first includes Maʿani, Bayan, Badiʿ; the second here concerns Maʿani and Bayan
• The first is only prose rhetoric, the second only rhyme
• Neither includes Maʿani