For this transition you will need to monitor and know the actual traffic patterns among the A/A interfaces in the zones. In A/A all interfaces pass traffic and that traffic can be asymmetrical. So there are two possible problem areas in the conversion.
Passive device interfaces down
If you have connections that go through what will be the passive firewall these connections will be lost when it goes from active to passive. The ports are link up but no traffic passes. So when this happens you need to be sure network devices that go through the now passive firewall will see the active firewall path as available.
Similarly, traffic that comes in from various zone interfaces will now only see one instead of two options. They all must be able to find the alternative path over to the active firewall where they formally used the passive.
Most of these issues will come up only if you have the A/A firewalls directly connected to other routers as an only path link. If the A/A firewalls connect to a switching matrix and share the VLAN in the respective zones, you likely won't have any issues.
If you post a diagram of your site we can help you be sure.
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