Would you like to import users from WordPress to XenForo, allowing them to access the new platform with their previous passwords? Or are you looking for a 'synchronization' bridge for users between WordPress and XenForo?
In the first case, you can try reaching out to @MySiteGuy
for help with any necessary queries or import and export.
In the second case, I believe there is a component that acts as a bridge, but I cannot recall the developer's name or verify it at the moment.
If you wish, you can check the resources section yourself