Vapor barrier when repairing only a section of drywall?

Background: Ran new cables between floors, through the walls (behind the drywall). Since then, I had an energy audit that confirmed that this section (and only this section) is now poorly insulated. This is an exterior-facing wall, and I am in the north so the vapor barrier is towards the interior of the room.

I opened this section completely, and found that it had unfaced fiberglass insulation with a plastic vapor barrier. When I replace the insulation, should I just use paper-faced insulation, or should I try to match the original 6-mil plastic barrier? There's an electrical box, so there will already be a hole in the plastic for this.