Same for those, but you need to style them the same way individually, unless you're using a bridge and include the MediaWiki into an XenForo page, but that would require more work than simply reproducing the XenForo style.
Create a header for XenForo and then basically copy its structure and move it to MediaWiki. Unfortunately I'm not used to MediaWiki, so you might ask in their forums on how to modify the header.