Not really. From my understanding both Barbarians and Druids are able to manipulate primal energies. They just use it differently. Druids mostly used it as part of their method to commune with nature, the elements, the beasts within nature, and even shapeshift. While the Barbarians mostly used it to greatly bolster their alreadly formidable strength. However some Barbarians have been capable of using some Druidic arts, such as the Barbarian elders who casted the barrier around Harrogath in D2 LoD.
Which is why I don’t have much issue with the visual effects of the Barbarian attacks, since I simply see it as the primal energy. For example, right before the (D4 version) Hammer of the Ancient skill hits the ground, you can see that the Barbarian’s weapon is glowing the same blue color that explodes. Once the weapon hits the ground, it no longer glows, but instead we get that explosion effect.