1) Do I need pro version of generateblocks if I had pro version of generatepress? Do I need both premium?
NO, you don’t. GB pro has some wonderful features to help with efficiency and help to avoid writing custom CSS, but it’s not necessary for every GP user, GP and GB are two separate products.
2) Can I do on generateblocks something like site bellow homepage where it has blog listing, then feature listing, then image, then listing again or like second site bellow?
No, GB can’t do that, you’ll need other plugins to create post listings and insert them into the page. GB can create the layout of the home page of the second website.
3) Also how this website on third URL does this deal page with marketer site library and generatepress theme?
I believe it’s using this plugin to create the page: https://wpcoupons.io/