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Please refer this http://docs.oracle.com/cd/E11882_01/server.112/e25608/standby.htm#i58150
You can have your OS on primary and standby servers to be different, but make sure that the same release of Oracle Database is installed on both primary and standby servers.
Note from the document:
Data Guard provides increased flexibility for Data Guard configurations in which the primary and standby systems may have different CPU architectures, operating systems (for example, Windows & Linux), operating system binaries (32-bit/64-bit), or Oracle database binaries (32-bit/64- bit). The same release of Oracle Database Enterprise Edition must be installed on the primary database and all standby databases, except during rolling database upgrades using logical standby databases.
Many thanks for help Shiva now I got exact information.