Historically, there are and have been a number of commonalities shared between the way that the Pittsburgh Steelers run their organization and the way the Green Bay Packers conduct their business. While the ownership structure is obviously necessarily different, both have been, for example, teams who primarily build through the draft and structure their contracts a certain way.
A big part of that is simply having stability, and both organizations had that for a number of years. In Pittsburgh, for example, they have had Kevin Colbert as their head man, and eventually being officially given the title of general manager, for a couple of decades.