Ok so I have a 17in macbook pro, the most recent model and I want to reinstall the computer like new but I lost the reinstall cds for it. However I do have the resinstall cds for my old macbook pro, but the cds say 15in macbook pro and they have OS 10.5.7 If I used the old cds would there be any problems or would it be best if I got replacements cds for the 17in?