Yes, you are correct...I am referring to inside walls on the exterior of the house.
There are no pipes or outlets on the two walls I am concerned with (see below).
One question/problem though. This may sound crazy, but have you ever heard of plaster/plaster board attached to brick without a traditional 2x4 stud? The reason I ask is because when I've drilled a hole for a 1" plastic screw anchor I get through about 5/8" of plaster and then I hit something solid and red. Usually I have to use a masonry bit to get the anchor to fit. When I tap on the walls, they are SOLID!