Hobbs calls their cotton & cotton blend batts (Heirloom) it's their brand name---no difference---just perhaps a different company- 80/20 is 80% cotton, 20% polyester- the only difference you may find is one may have a bit different loft than another- but i've used many different 80/20 blends- and havent noticed much difference- as long as you didn't mistakenly get a fusable- when fusable was not wanted i see nothing to worry about.