Verified answer

You can open both pictures as a document on photoshop. Then you use the move tool and drag whichever picture you want on the top over and change the opacity level to a little less so you can see the background. Or you can just drag the picture over and then erase the parts you don't want from the dragged image and see the background like that. make sure the lighting are in the same directions.

Select the area that you want to have as a back ground then insert your background image into that selection.