Best way to sync data from temp database back to primary one?

Hello all!!
I'm trying to figure the best way to remedy this situation.
I have a RAC cluster...and one instance went down...some problems with all nodes running, etc. Anyway, while working with Oracle support, I was able to get one node up with sqlplus, and I ran a datapump export, and move that file to a test server I have...as that this was the quickest solution, and I was able to get my developers up and running again on the new server.
I've been working with Oracle support for weeks now...and now all instances on the main RAC cluster all seem to be up and running now.
The trouble is...the instance that was 'moved' to the test server...has had a LOT of work on it in many of the schemas it contains. I need to move the developers back to the main unit where backups are taken and more horsepower for load testing, etc.
What is the best way for me to sync the main server up with the changes made in these weeks on the test server.
Would it be best to take a datapump export from the test box.....move it over to the main server, and basically then....truncate all non-system schemas and just import from the test server (with changes) back onto the main server?
Any other suggestions?
Thank you in advance,
cayenne
ps. Both main and test servers are same version of Oracle 11Gr2 RAC. No rman backups currently being taken on test server, not in archive log mode on test server.

The trouble is...the instance that was 'moved' to the test server...has had a LOT of work on it in many of the schemas it contains. I need to move the developers back to the main unit where backups are taken and more horsepower for load testing, etc.What is the nature of the work? Cleaned and filtered data? New code/stored procedures/triggers/metadata?

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l_min_mail_id number;
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