When she slips the word "mandatory" in front of gun buyback, which she did, then it IS the same thing.
This the the quote I am seeing:
Her spokeswoman also clarified that she was absolutely not talking about mass confiscation. But people are going to hear what they want to hear, really. People still act like Obama is taking away guns, despite 7 years of zero legislation or changes in Federal gun laws. (other than the assault weapons ban actually expiring.)
I question why Clinton would bother with the statement, as it just gives the NRA ammunition against her, but this seems more like a red herring than an actual issue. We have plenty of real stuff to criticize her over.
edit: tl;dr
She isn't coming for your guns. She does want to spy on you and doesn't care about the middle class.