Unfortunately, the two CDs you mentioned have the same FreeDB ID. This happens from time to time, although the probability is pretty low. The consequence is that OrangeCD does not differentiate these CDs. You can use the following workaround to add both CDs to the database:

1) Add the first CD.
2) Use Tools - Duplicate menu command to create a copy of the first CD in a separate entry.
3) Delete the entry that you added on step 1.
4) Add the second CD.

The drawback of the proposed workaround is that the first CD will have black icon instead of blue one, and will not be recognized by OrangeCD player. There is no way around that at the present time. In future, something will be changed to fix this problem, and the icons will be customizable for each database record.