64-bit to 32-bit standby

"Getting Started With Data Guard" document states the following: <<The hardware and operating system architecture on the primary and standby locations must be the same. For example, this means a Data Guard configuration with a primary database on a 32-bit Sun system must have a standby database that is configured on a 32-bit Sun system. Similarly, a primary database on a 64-bit HP-UX system must be configured with a standby database on a 64-bit HP-UX system, and a primary database on a 32-bit Linux on Intel system must be configured with a standby database on a 32-bit Linux on Intel system, and so forth.>>

We have a standby database configuration working with two Xeon servers. Next week
we upgrade the master to IBM xSeries 226 which has Intel Xeon EM64T, i.e. AMD's Opteron kind of 64-bitness but slave will remain the same. Apparently we can not just slap Redhat 64-bit and Oracle for Linux 64 bit and expect standby database to
accept master's archivelogs. So Oracle need to be 32-bit.

My question is, can master be Xeon EM64T, Redhat 64-bit, Oracle 32-bit and standby: Xeon, Redhat 32-bit, Oracle 32 bit? Have someone tried it? What were the results?

Best regards,
Nicolai

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