how to patch a productive cluster properly?

Mr.Gosh

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Jan 5, 2016
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Is it a problem if i want to create a cluster on an proxmox 4.2-5/7cf09667 and add an full updated proxmox 4.2-11/2c626aa1 as the second node? or do they need to have the same patchlevel?

To ask different:
How to patch a cluster propperly? just one after the other and the re-add themself automagically, or is there some special advice? I didn't find a "best practice" hwoto in the wikis regarding this...