Totally different areas.
Baltimore was more similar to Pittsburgh insofar as they were inward looking, very protective if not sensitive about what people thought about their city whereas folks in DC area generally don't give a rip. Alot of this has to do with DC being a transient area with many folks being from somewhere else. Similar to Pittsburgh, you have people whose family have been there for many generations, often coming from one of the old ethnic neighborhoods (although alot of these folks have moved to the outlying suburbs).
As far as high school football is concerned, I have been preaching about the Balt-DC area for years. Lots of good coaching in the area with very talented athletic kids who grew up playing hoops and with the influx of West African and Carribbean kids, you have an expanding base of talent in area. Also lots of kids coming from military families. I grew up playing Optimist and high school ball in Miami back in the 1970s and early 1980s, seeing my share of football players and I can opined that DMV football is up there as well.