I did each for about a decade and there is a difference, though both [hopefully!] are grounded in the same text.
Teaching in the academy in the US tends to be content-oriented, rather than transformational. Professors usually leave the application to individual students, believing that they are now capable of integrating their learning with their personal faith. [They are probably not doing so, the reason many Christian colleges are now stressing that the integration of faith and learning as a course objective.].
Preaching is all about transformation, the more specific the call the better. In fact, I have told students I see the Bible study as a "shotgun approach" to spiritual growth, while the sermon is more "like a bullet." Both are aimed at targets, but the former is wider and broader, while the latter is more specific and penetrates deeper.
I recommend acquiring a good applicational commentary, like the NIV-AC, or a devotional commentary, like Matthew Henry (Sorry, I can't think of anything any newer). Both are good models of moving from text, to principles, to specific application.
Enjoy your new position!