I’m sorry to doubt this (they probaly were together, the shade of paint is kind of the same) but…
1) The windows do not match, the one behind Harry has sort of like a bolder bit, the “picture” of Louis’ flat does not.
2) The picture on the wall is too high for Louis’ head to meet, the frame is also kind of different by the look of it. the picture frame on the top photo reaches the top of the curved door way, Louis is not that tall.