The only real difference is that they have the permanent for one or two more turns (knowing that it will be destroyed and when), the cost, and any synergies strictly because of the element.
I think that, if used on a pillar stack, it consumes one pillar per two turns / per turn until the stack is gone. It would justify a raise in the price and suit the name. It's basically what Malebolgia said, as long as that is what he meant by "burning".