The best way is to modify your style in XenForo to look like Wordpress. It's not a straight copy/paste job. It might require some custom HTML and CSS.
The overall HTML skeleton in XenForo is this template:
Admin CP -> Appearance -> Templates -> PAGE_CONTAINER
Then there are properties for the header area:
Admin CP -> Appearance -> Style Properties -> Header and Navigation
Any custom CSS can go into this template:
Admin CP -> Appearance -> Templates -> EXTRA.css