Ibicella almost always produces smaller claws than Proboscidea under natural and ideal growing conditions. The seed pods of Ibicella are hefty, round, and "hairy" while the seed pods of Proboscidea are long, stretched, oval-shaped, and fairly smooth. See the attached picture I got from sarracenia.com to compare the claws. The one on the left is Ibicella and the one of the right is Proboscidea.
The white seed variety of Proboscidea is domesticated (AKA var. hohokamiana). It was selected and developed by O'odham Indians for claw length and ease of germination in order to use the fibers of the claws in basket/craft weaving. Other Proboscidea species and varieties have black seed, and according to Larry, contain germination inhibitors. Thus, making them more difficult to germinate. Your P. louisianica and I. lutea should be growing black seed.
Hope this helps a bit.