@lhatfield96, These scans are interpreted by radiologists that may have slightly different views on what they are seeing. I'm not a doctor or radiologist, but I can only imagine how difficult it is to measure the haze of GGO. The difference of 2mm could be due to differences in interpretation. Having a doctor sit with you and compare the images from both scans would help to answer your question/s.
Do you have a follow up appointment scheduled with the doctor who ordered the test, or with a family med doc/general practitioner? If not, I would call and get an appointment set up to get your questions answered.