This screencast shows two methods for copying a component inside Fusion 360. One method retains likeness when either component is edited and the other allows edits to take place on each component independently. Keep in mind that you can make edits to both components by scrubbing the timeline to before the copy command.
*Bonus tip: I show how to use the custom pivot point when moving/copying objects. This saves time, but make sure you "capture position" after.