Nabi Vs Rasool Proof
They are used in the same meaning i.e. Rasul as a terminology, not in literal sense. (Please do share the Quranic references with your question)
No, there’s no difference here, Rasul is used as a terminology in both these instances.
Ghamidi Sahab is saying the same thing, please listen to it again. Here Rasul is used as a terminology in both these instances of Quran (10:47) i.e. the one with responsibility of itmam-e-hujjat. Ghamidi Sahab is using this verse as a defining principle of what is Rasul ( as a terminology ).