RAC,  ASM and Dataguard compatibility

We have a Dataguard setup with 3 node RAC. The primary is a 3 node RAC but the standby is a single instance. The ASM version is 10.1. Currently we have switchover the roles.
Can upgrade the ASM to 10.2 on standby then make it primary?
All I want to know is if we can have ASM 10.2 on primary and ASM 10.1 on physical standby?

The note for latest ASM [ 10.2  ] indicates a level of backward compatibility I believe
What version is the database ?

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