Share some classes in your Stylesheet among different news pages if you can.
You can use the same technique for overview pages.
Make sure you don't break the PHP code in the subtemplates.
If you have several news pages, you can use a different (sub)template for each page. For example, let's say you have a blog page and a news page. In your news page, you want to have title and time only. In your blog page, you want to have title, time and teaser.
To use a different (sub)template for each page, do the following in RiteCMS 1.0.0+.
You just defined a new template for your second news page!