There can be only one CallPage code on the website. If you want to display different widgets within one domain you need to merge widgets. The new code will be generated and you will be able to paste it to your website. After you create all widgets you want to have on your website you need to go to Widgets >> Edit widget settings (pencil icon) >> Tools >> Merge widgets. Then you create rules (+ Add rule) for each widget to decide which widget will display on which page or group of pages. At the end you click Generate code, copy the code and past it on your website.