Take a look at thread http://forums.adobe.com/message/4650797#4650797
You can directly replicate the users between instances publish1 <--> publish2 by using workflow & conditional property to avoid looping. Horizontal replication.
Thank you Sham for the replay.
do i need to customize the workflow to replicate user nodes? what is Horizontal replication?
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The steps to move from publish1 to publish2 instance without replicating to author is
1 Setup replication agent in each publish instance.
2 Create Workflow Model to activate the user.
3 Configure Workflow Launcher to listen for new registration & call the model created in step2. Please note:- In launcher you need to set condition to avoid infinite loop & especially with modification.
If you could file a daycare we can understand your requirement better & discuss prons/cons & can come up with proposing right implementation.