So, if you have a 25-inch TV screen, no one should be seated closer than 50 inches, nor farther that 200 inches from the screen. I teach my high school TV production class with a heavy emphasis on the technical aspects. Across town, the TV production teacher teaches mostly television acting, directing, and set design. The same course taught by two different teachers could result in very different educational experiences. It doesn't really matter if the teachers are across the hallway or across the continent.
Most teachers focus on what they like to do, and what they think is important.
Differences in course content can be good. We, as teachers, bring more than our training to the educational table. Most course outlines are written to allow for such diversity. We are provided with standards and competencies, not daily lesson plans. As long as both teachers are teaching the basics and covering their school system's course requirements, everything is fine.