Hi there!
Thanks for reaching out.
You can export your recently created article index page, then create a new SP Page Builder page and import the exported page there. After importing, you can select a different category for the collection addon.
https://cleanshot.com/share/VzdCFXLL
Then, create a new menu item with the type SP Page Builder → Pages and select the newly created page. This way, you can create multiple blog pages for different categories while keeping the same layout.
Related blog post link: https://www.joomshaper.com/blog/create-a-dynamic-blog-in-joomla
Respective documentation link: https://www.joomshaper.com/documentation/sp-page-builder/collection-index
Hope this helps!
Best regards,