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Easiest is this way, there will be a minor glitch on failover nr 1:

• copy the interface lines from show configuration interface and adjust inthe following way:
  • on the old interface issuing delete interface eth1-03 vlan 25 will delete vlan 25 and all the config from it.
  • add the vlan's to the new interface by adjusting the old commands setting the correct interface
  • Copy and adjust the set interface ipv4-address commands
  • double check those commands make sure to also copy and adjust the set interface state on commands
• on standby member run cphastop to disable clustering
• paste the delete vlan commands
• paste the add vlan and set IP address commands
• now update the interfaces of the backup member in the cluster object, the member interfaces are set in the Advanced tab of the cluster interface configuration
• push policy
• run cphastart on the backup member
• flip the cluster over to the backup member ( this could give a dip in the connections
• now repeat the above steps for the other member

Good luck and be aware to plan this in a maintenance window, easier to tell everyone this will caus 15 minutes downtime and be done in 1 minute than the other way around.