For the 2016 playoff game to have been the 2014 playoff game all over again, you would have needed:
1. Elliott to fumble and lead to points for Green Bay (e.g. Murray 2014 playoff game).
2. Bryant to catch/not catch/<expletive> Blandino (e.g. Bryant 2014 playoff game) and subtract a likely six or seven points for Dallas.
Additionally
3. Prescott not throw an interception deep in Packer territory (e.g. something Romo did not do in the 2014 playoff game) and subtract three, six, or possible seven points on an earlier drive.
Every game is different. It could be Green Bay could have blown out Dallas in the 2016 playoff if certain game day conditions had been met. Likewise, Dallas could have blown out Green Bay if certain events had occurred.
However, using Romo as the only variable while comparing each respective playoff game does not logically work. In fact, it is arguable that it works more against Prescott and lessens the responsibility of the defense's actual failure during that specific game.
The redzone pick by Dak hurt, but he played well overall. The slow start by the offense and then the overall fail by the defense was what killed us.
Besides the things you listed, I think the main difference between the 2104 and 2016 games was the location.
It's not even comparable to play a home playoff game indoors vs on the road in January at Lambeau. The home field is supposed to help the home defense (noise and pass-rush wise) tremendously.
The only other times Dallas has played a non dominant defense in a Home playoff game was last year vs Seattle and in 2009 vs Philly--whose D was decent but not great like the peaking 2007 Giants or the dominant 2014 Lions Ds were.
In that 2009 game, Dallas was leading 34-7 early in the 3rd period and Romo and the offense were heading toward 50 points and 450 yard passing before they completely shut it down for the easy win.
I want Dak and this Cowboys group to get home field advantage for more than one game. That was the recipe for New Orleans' SB win and often is the case for others.
Go Cowboys