I wont send the mothership to pick you up just yet..
Your particular model of the Incubator should be a lot easier to tell the difference. The head end half of the quilt is more cupped shaped. The foot end section of the quilt will not not have any differential built into the length...because it is not cupped. it almost looks like a shelf that you legs lay on. If that makes any sense.
HERE is a photo posted by ChrisH (thanks Chris) that shows the FOOT end on the left side of the photo.