Word Biblical Themes Collection

How does the Word Biblical Themes Collection differ from its similar commentary?

I don't have these resources but the product page says:

Finding the great themes of the books of the Bible is essential to the study of God’s Word and to the preaching and teaching of its truths. These themes and ideas are often like precious gems: they lie beneath the surface and can only be discovered with some difficulty. While commentaries are useful for helping readers understand the content of a verse or chapter, they are not usually designed to help the reader to trace important subjects systematically within a given book a Scripture.

The Word Biblical Themes series helps readers discover the important themes of a book of the Bible. This series distills the theological essence of a given book of Scripture and serves it up in ways that enrich the preaching, teaching, worship, and discipleship of God’s people.

So it looks as though they are focused on exposing and outlining key themes within a biblical book as opposed to a verse-by-verse approach.

If you click the See Inside button on a product page for one of these resources you should see the table of contents which would provide an indication of the themes covered.