Different names, overlapping documents
In everyday New Zealand business use, "NDA" (non-disclosure agreement) and "confidentiality agreement" are often used for the same kind of document: one party agrees not to disclose or misuse information the other gives it. What a particular document does depends on its wording, not on its title. A short, one-way NDA and a detailed confidentiality agreement in a sale process can look very different, even though both deal with confidentiality.
The useful question is not which label to use, but what the document says. Your lawyer will choose the form that suits the situation; your job is to know which commercial points you need it to cover.