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As per my knowledge you can do this as both the database major version remains the same. There will be no problem in doing it.
Thanks Sourabh.. Is there any metalink or oracle doucmentation to confirm this information?
This will depend upon type of Standby.
For Logical is is possible, for Physical no.
Here's a supporting MOS document :
Mixed Oracle Version support with Data Guard Redo Transport Services [ID 785347.1]