Just use the same interface names for the bridges. If you for example use vmbr0 for VMs/LXCs and vmbr1 for management then do the same on the second server. Not that important for the bridges as you could restore the VMs and then edit the vNICs before starting them if you don't plan to run a HA cluster. More important for the StorageIDs, especially when making use of multiple storages for a VM, as right now PVE won't allow you to select which vDisk should be restored to which storage. You can either restore all vDisks to the same storage you select or you don'T select a storage and it will restore them to the same storageID they were on when the backup was done. So only way to restore vDisks to multiple storages is to have the same storageIDs.