I was told by parts man that it is not advised to install the factory unit without the integrated brake system. Ram is supposed to have a kit out by end of Jan. to avoid the issue.
The factory unit is the integrated brake system, they are not different item. Integrated brake controller means, OEM brake controller. If you have both plugs in the harness, you should be fine. The kit I think focuses more on the fact that some harnesses only have one plug.