08-18-2016 23:52
08-18-2016 23:52
08-19-2016 00:33
08-19-2016 00:33
I have never heard of a different fitbit model being provided as a replacement and would feel it's unlikely that they would offer a lower specification model as a warranty replacement.
It might be best to give them a call / email to check though - it would be easier to sort out now than later