Careful: a government board has one interest (welfare of its constituents) and multiple opinions about how to serve it. A corporate board has one interest (welfare of its shareholders) and multiple opinions above to how to serve it.

Besides that, both types of boards can have a variety of unofficial/official power structures, consideration of the welfare of non-constituents/non-shareholders, and varying degrees of competency.

This isn't to say that any type of governing body has arbitrary properties. Predictable inequalities exist.

Governments also have only one interest in mind: continuity of power and welfare of the government members. Or somebody still thinks that governments serve the people?