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I have not done this myself, but pl see if these MOS Docs can help
RMAN Restore of Backups as Part of a Database Upgrade [ID 790559.1]
Frequently Asked Questions about Restoring Or Duplicating Between Different Versions And Platforms [ID 369644.1]
As always, test this process using a test database before attempting it on production :-) Your test environment should be as identical to production as possible. Pl also post exact OS versions.
If this process works for you, would appreciate you posting a high level summary of the steps you took so as to benefit others.