Hi,
I created and configured this template for one website.
Now I want to use this already configured and finished website on second domain with just different color.
Can I do that and do I need to pay extra money for using it twice.
Thank you
Yes, each separate site would require an additional license.
There are two ways to clone your site: with the free plugin All in one WP migrate or install and upload the demo that you used on your first site and transfer the theme settings from one to another. You can do it in the Theme settings > Export/import.
I would recommend you using All in one wp migrate, you will just change the colors.