Board Thread:General Discussion/@comment-8345449-20140409101456/@comment-9232373-20140409190712

ChocolatEyes613 wrote: Hmcooper4 wrote: Actually, I'm beginning to wonder if it IS the same old curse. If I recall, the creators said, that it is the same curse. Zelena had to sacrifice someone's heart. It is just a question, of who's heart did she use. It would be incredibly funny, if Zelena was in love with Glinda.

Rumple's curse required you to use the heart of the thing you love most, which in Zelena's case is Rumple... so maybe that's why her curse is slightly different than Regina's, she used a slightly altered version of it.