Deactivated1240/Billie stronger than Prue?

Is Billie stronger than Prue? I was thinking that since Billie was only in her first or second year of being a witch, and had telekinetic strength that rivaled Prue's during her third, and Billie has projection, which is no doubt stronger than astral projection, that maybe Billie was stronger than Prue. But that does't really make sense since the Charmed Ones are supposed to be the most powerful witches ever, right?