While Passiflora (Passion Flower) and Morning Glory (Ipomoea) are both breathtaking, fast-growing climbing vines, they are two entirely different botanical families. Sometimes people combine the names when looking for exotic, heavy-blooming climbers, or because both flowers open up beautifully to meet the morning sun.
Passiflora (Krishna Kamal): Famous for its highly complex, multi-layered exotic flowers, crown of filaments, and delicious passionfruit.
Morning Glory: Famous for its clean, trumpet- or funnel-shaped flowers that open fresh every morning and heart-shaped leaves.