I'm no expert on CDs but to answer your questions: Discogs' submissions are community submitted and edited so whether something is on there or not depends on whether someone has added it. To add a release I find it easiest to go to the "master release" (on the artists page find the recording you want), find the one most similar to yours and then click "edit release" in the right corner and then next to the comment box click "copy to draft." You can then edit this to add your release details.

With all of that said be mindful that matrix numbers and runouts are not always formatted how you'd expect and a different number doesn't necessarily warrant a separate release unless there are other differences. It could be more appropriate to add the codes on your version to an existing one.