How does jinās al-qalb differ from reversible qalb?

Qalb, Tashrīʿ and Luzūm Mā Lā Yalzam: Completing the Verbal Ornaments

• Jinās requires metre while reversible qalb requires rhyme
• They are identical terms
• Jinās compares two words; reversible qalb compares an expression with its own reverse
• Jinās al-qalb occurs only in prose