In this reading, the two actions are expressed as verbal nouns.

فَكُّ رَقَبَةٍ أَوْ إِطۡعَامٌ

In this reading, perfect verbs are used, conjugated for the human being mentioned before.

فَكَّ رَقَبَةً أَوْ أَطۡعَمَ

Abū Jaʿfar al-Madanī

Ibn ʿĀmir al-Shāmī