Not much will change, Reid still had the final call.
http://www.cbssports.com/nfl/story/12767899/heckert-leaving-eagles-to-become-browns-gm (http://www.cbssports.com/nfl/story/12767899/heckert-leaving-eagles-to-become-browns-gm)
As far as the final decision goes, he's just a figurehead. What could hurt though is if the legwork he does was better than most. We'll see with the Browns over the next couple of years.