Well, yes, you create widgets in IDX Broker, and add them wherever you choose in your pages.
When we (or you) add the IDX Search Bar, we create a widget in IDX Broker, and add it to the theme widget area, and also include some custom styles in style.css.
You can create a widget for your listings in IDX Broker and add it instead of the AgentPress Listings on the home page, but you will also need to style it. To have the listings look like the Winning Agent Pro demo, you need to use the plugin, and add as a minimum the detail fields that are shown on the home page. As I mentioned in an earlier reply, you can use both the AgentPress Listings and the IDX Broker info for that property on the same page.