There are two Ner Israel yeshivos in baltimore, but they share the same building, name, and facilities. But sit on different sides of the beis medrash.
One is mostly for bochurim in their first few years post high school, and these bochurim usually end up in eretz yisroel and then Lakewood.
The other is mostly for bochurim who are returning from yeshivos in eretz yisroel such as Beis Yisroel, and are going to college at night.
So you really need to be specific which Ner Israel you are talking about. You can know which one a boy is in by asking how many years out of high school he is, and whether he is in college.