Unfortunately, the title is very misleading. I was looking forward to reading about how to "properly" do it.

Website plagiarism is one of the hardest things to prove because the proof can't be design similarity; even though, the website's design is intellectual property and copyrighted. The de facto for website developers has been to include a code in their images and to replace common design elements with company logos (or graphics specific to their organization).

Has the website in question taken graphics and company-specific elements as well? No, they haven't; so, there isn't enough to claim plagiarism. I think both websites are using common layout designs.