Can't make out the brow tines in the first pic. Possible. Similar frame, 2 years apart though and not much difference so I'd say no.
The brow tines are fairly unique but cannot be seen in the first picture. I would expect more of a body change in two years also.
Antler structure is very similar however with the blow up of the brow tines in the 2015 pic, I'd expect more antler growth overall in 2 years. There could be a genetic relation between the two bucks. Same father or mother?
Considering both are more than likely 3.5yo deer, it would be impossible for the to be the same buck.