Different header for blog page and posts

Ok, so I’ve created a header for my blog page called header-blog.php and I just placed the include_header statement at the top of my blog template page in my theme and that works! I want the header to stick though when people click on the single blog posts. So I copied the single.php file and named it category-29.php (my “blog” category) with the include_header statement, but now I don’t really know what to do with that lol. My site is a commerce site and so I want the blog part of my site to have it’s own header. So now that I have page part figured out, how do I do the blog posts?