According to the Page that appears, Oracle is claiming to
Oracle plans to migrate and offer Sun certification offerings to Oracle certification offerings. Changes in the program will be communicated to candidates on the Sun and/or Oracle Certification Program Web pages. Please check these sites frequently if you have questions or concerns.
I am basing this off me experience with the similar SCJP mock exam they had on their website. In that the questions were similar in nature but obviously not the exact same questions are used. The only real difference is that there are no drag and drop questions in the mock.
I found that I got a very similar score in the mock exam as I did in the actual exam for the SCJP so I am planning to use it in the same way.
subject: What has Oracle done with the mock certification tests?