If the tracks are the same and in the same order it's possible that the only difference is the label that released the CD. It's also possible that although the track names are the same they are actually slightly different versions - like the album version on one and the radio edit on the other (sometimes they don't identify those differences on the cover).
As an example, I once bought a set of the Eagles first 3 CDs for $9. They were released by Warner Australia. I later bought all of the rest of their CDs released by Warner USA and was curious if there was a difference. So I bought the Warner USA version of the same Warner Australia CDs (because I am goofy and wanted them all to be from the same label). I ripped both the USA and Australia releases and compared the tracks and they were bit for bit identical.