Muraṣṣaʿ occurs when most or all words in one prose unit correspond to paired words in the other in both pattern and rhyme. Its sound design extends across several positions rather than only the final word.
The test is phonetic and structural, not a requirement that corresponding words be synonymous. Some examples have fuller correspondence than others, and a nearly complete arrangement may be distinguished from a completely matched one.
Simply identifying a common final letter captures ordinary sajʿ, not the broader parallel ornamentation of muraṣṣaʿ.