11 is the more of a ball carrier whereas 14 is more like a fullback.
New Zealand, Savea 11, Milner-Skudder (Plays 15 for Hurricanes) 14
Wales, North 11, Williams (Plays 15 for Scarlets) 14
Australia, Mitchell 11, AAC (13 or 15 for Waratahs) 14
England, May/Nowell 11, Watson (15 for Bath) 14
Ireland, Kearney/Zebo 11, Bowe (Grew up playing 15) 14
South Africa, Habana 11, Pietersen (Grew up at 15, still plays there regularly for the Sharks) 14
Scotland, Seymour 11, Maitland (Played 15 for the Lions and regularly at his club) 14
Hope this helps