Well, you're going to have to use a product that is doing replication properly. This manual process just isn't going to work, and there's no way around having to specify the network because it's keyed off the ID of the port group. This will be different at the destination vCenter even if the names are the same, so again, you either need SRM or some other product that will do the mapping for you.
Thanks Daphnissov. I'll think of some script : )