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You can but there is a support matrix. Sometimes it's a little out of date though.

Yes. This is no problem. Generally it is best to have the SDX at the same or later (build date) than the instance. In this case it is expected that the SDX will be behind the instance.

ta both

Yea, they try to keep them pretty in sync and yes, its so that the SVM can support and understand everything in the build of the instances on top of it that it manages, but yea, in this case, you can upgrade with them being that close, should be good