I think you're looking for the difference between a lockoff 2br and a dedicated 2br...
The only difference is in the second bedroom or studio portion.
If it's a lockoff, the studio will have the mini kitchenette, a door to the hall, and a pull out sofa instead of the second bed.
In other words, you can lock the connecting door and you have a studio and a 1br.
A dedicated will have a second queen bed, no door to the hall, and extra closet space.
MG