Conditional display based on URL? Is it possible?

Hi everyone, I'm building a webshop using Elementor Pro, and the site will be accessible from two different URLs. How can I set it up so that if the site is opened from a.com, the header is blue, but if it's opened from b.com, the header is green? I've already handled the technical part, and both URLs work perfectly, including navigation between the pages. However, in the Elementor editor, you can only set 'From URL' as a condition, meaning which site the user came from to ours. I can't find anything similar online. Thanks!