Paper and board packaging are offset printed or digitally printed;
CDs and DVDs are silkscreened or CMYK process printed onto the plastic surface of the disc. Because of the inherent differences in printing methods, inks and surface materials, the end result can be significantly different even under the best of circumstances.
If you use the same image or similar colors on your disc as on your packaging they will probably not match; if an exact match is critical to your design we recommend altering your on-disc design to use contrasting or complimentary colors rather than identical colors or images so a color match is n/a.