Mutawāzī sajʿ occurs when the ending words of the two units agree in both pattern and rhyme, without requiring word-for-word matching throughout the clauses.
The focus is the structure of the fawāṣil: compare their final letter and morphological or verbal pattern. Correspondence among every earlier expression is unnecessary.
Both mutawāzī and muraṣṣaʿ can share matching end words, but muraṣṣaʿ extends the correspondence across multiple paired expressions.