You may ask what this has to do with FIFA 14, 15 or 16 ? Well, these are bad news for those still playing them since all faces converted from previous FIFA versions ( FIFA 17, 18 ) were made using PS3 ones. Since there are no new faces included in FIFA 19 PS3 version none of those faces you have seen on PC, XONE or PS4 can be converted to FIFA 14.
FIFA 19 PS3 Legacy Edition just includes updated kits and squads. No new faces or stadiums that can be converted to FIFA 14. So do not expect them to be released. Anyway, we expect to get textures from PC version that may help to update faces or create new ones if community modders still are interested in creating new faces.
Since FIFA 19 for PS3 will be the last one for that generation, unfortunately, we may have reached the end of an era. FIFA 18 faces were the last ones that could be converted to FIFA 14, 15 or 16.