Compare two Qur’anic contexts:
«أَوْ تَحْرِيرُ رَقَبَةٍ»
Or freeing an enslaved person. (5:89, expiation for an oath)
«فَتَحْرِيرُ رَقَبَةٍ مُؤْمِنَةٍ»
Then freeing a believing enslaved person. (4:92, accidental killing)
The first noun lacks an explicit belief adjective, while the second includes one. Thus one is an example of unrestricted wording and the other of restricted wording.
These involve different legal causes. Their similarity alone does not settle whether a condition from one setting governs the other; that needs separate legal analysis.