Pretty much.
With item packs, it's rather complicated, yet very annoying. You two may have different items.cfg files. FH will pick up the item by the order of the list it is on. For example,
your items.cfg
[ red]
[ blue]
[ green]
your friend's items.cfg
[ blue]
[ green]
[ red]
If you are wearing the item 'blue', your friends will see 'green'. What you guys can do is share the same items.cfg files and you'll be able to see the same items.