Hichigo definitely has moves that Ichigo doesn't.

I specifically remember one time when the two of them fought, Hichigo started holding his Zangetsu by it's wrapping and swinging it around like a flail, and Ichigo went, "I didn't know you could wield Zangetsu by its wrap."

Quote Originally Posted by Logrus
Hichigo said he and Zangestsu were orginally one? and Hichigo always uses that reverse shikai of zangetsu. Does that mean boht Zangetsu and Hichigo have/are 2 diffrent swords?
I agree with this because it fits into my theory of Arrancar blades being different from Shinigami Zanpaktou, and Ichigo could actually have both. I think the reverse blade that Hichigo uses is what Ichigo would have if he ever became an Arrancar.