The DOJ action was filed in the MD of NC, it is case number 1:16-cv-00425. No judge appears yet to have been assigned (or at least it does not show on the PACER, the on-line records system for federal courts).
McCorey’s political stunt was filed in the ED of NC, and they drew Judge Terrence Boyle, who was Jessie Helm’s right hand man, and was put on the district court by Reagan. Bush I nominated him for a seat on the 4th Circuit, but the democrats refused to consider him. He was then renominated by Bush II, but he was again held up, and ultimately defeated when the democrats took over the senate in 2006.
Since they are in different districts, they will not be combined absent an unusual situation, and I doubt that a Federal Court would transfer the DOJ suit from where it was filed, Defendants are not usually allowed to try to pick the venue like NC tired to do here.