Both parks seem to be hemmed in identically by major roadways. The "expansion pad" also seems to be identical in both parks; the triangle shaped area next to the Millennium Falcon ride that has two cheap pre-fab buildings thrown up on them in recent months. The only difference is the placement of those two buildings is slightly different at Disneyland.
These two buildings between Millennium Falcon and Toontown; the white building on the right, and the two-story building under construction. These were both roughly duplicated at DHS.
But they are cheap pre-fab buildings that could be used for 3 to 10 years before being torn down and replaced with an expansion attraction or offering of some kind.