DataGuard 10gr2 (10.2.0.4) AIX 5.2-primary Aix 6.1-Standby possible?

We currently have 10.2.0.4 DG configuration running on three AIX 5.2 servers (one primary, two standbys). We will be installing some new servers that will be pre-loaded with AIX 6.1. If we were to install 10.2.0.4 on these new AIX 6.1 servers is it possible to create additonal standbys on them? Or is there a limitation in 10gR2 Datagurad that the OS versions must be exactly the same?
Doc ID: 413484.1 indicates that this is possible but I am unclear if this only applies to DataGuard 11g?
Thanks in advance. It would also be appreciated if anyone knows of an Oracle document that definitively states whether this can or cannot be done.

Whilst I've only done AIX upgrades at the level like 5.2 to 5.3 etc using standbys, there is no reason that a major OS release level shouldn't function correctly. As long as both run the same DB software patch level (10.2.0.4 as you've stated) then it should be fine. If you're really paranoid raise an SR with Metalink and get it in writing.

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