Structured differently? Sure, but the fields are extremely similar in that they're both studying ancient religious texts about which we have very little evidence as to their actual course of development (as is the case with all ancient texts). But I didn't mean to assume any general similarity between Quranic studies and New Testament studies, anyway. The textual evidence for the Quran is much more recent, obviously, but the textual evidence for the NT is actually the best we have from the entire ancient world, by far. There are lots of other differences...