FWSM Failover - Possible with different hardware versions?

Hi, I need to replace a FWSM module currently running as the primary unit in a failover configuration installed in two 6509s. The replacement FWSM module is a newer hardware version than the current module it is to replace. Obviously I will ensure the same IOS and licenses are installed on the new module but will having a difference in the hardware versions affect the failover configuration?
The faulty module being replaced has the following hardware config:
HW 3.0
FW 7.2(1)
The replacement module has the following config:
HW 4.2
FW 7.2(1)
Thanks in advance for any help..

Daniel, this is a good question for TAC. I do not see any ducumentation on FWSM requiering to be same Hardware version, the failover requires same code and you are correct on that one. I don't think hardware version diferences may affect failover, I would suggest to have it cleared by TAC.
Jorge

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