No, you need to create a new widget for each site!
A maximum of two widgets can be found on one site, each of which can contain up to nine ads. You can customize your site’s widgets to fit the design.
You can also customize the widget position on your site to set ads to appear at the beginning of text, in the middle, or at the end. The widget’s position is especially important and often affects whether users click on the ad.
Our proposal is to create a widget with four smaller ads at the beginning of the post and six higher at the end. Don’t overdo the ads, if not necessarily, because it can reduce your traffic quality.