When I quilted the red and the blue enchantment quilts, I did them in tandem. When I ditched, I zipped one of and then zipped on the other quilt to do the ditch stitching. Same with background quilting or border quilting. That way when I set up the machine and the threads, it worked for both. It was fun and a novel way to work; best of all, I finished them both on the same day!