Hi Carsten,
When you talk about "configurations" - are you referring to the updates that are done to the MDB when you applied CP2? OR are you talking about other configurations? Please give us some specifics.
As a best practice, its always best to copy an MDB between environments only when they are at the same patch level (especially for cumulative patches).
In this case, if you wanted to refresh the data on the test system from prod, what you would want to do is restore the prod db on the test environment, then re-run the cp2 installer on the test environment to ensure that the proper MDB updates are made. Then perform the post steps which include some data loads, which would need to be done as well.
Hope this helps a bit,
Jon I.