Souls at Zero was pretty much Wrathchild America under a different name. The name change was apparently driven by the fact they were dropped from their label and that they were adopting a different sound.
I really don’t know. I never really had much of opportunity to listen to Wrathchild America before Souls at Zero. From what I hear, the biggest change is that they slowed down a little bit. Aside from that, there’s really no difference between the sounds.
Oh, I think singer Brad Divens got a haircut.
Anyway, here’s Souls at Zero’s video for their track “Never” from their self-titled album. It’s a pretty good song and features a guitar talk box (I think).