New Machine Domino Testing (involving cluster)

Next month we will be installing and bringing live a new model 520+ that
runs our 'main' Domino server and Websphere setup.  We are clustered with
another iSeries based Domino server that we consider the 'backup' Domino
server (we keep users off it normally with SERVER_RESTRICTED=2 unless we
specifically want users on this server instead).  We can easily control
which server our apps and email are currently flowing to via DNS and
firewall changes.

Since we've gone to the clustered setup, it's been easy to test Domino
releases and such, because we can switch the users over to the 'backup'
Domino server and test things on the other server while it's not actively
serving apps or receiving live email.  This new box brings a slightly
different challenge to my testing plans... I want to try and test as much
as possible on the new box before doing a final save/restore migration, but
don't want to get in any trouble with cluster replication, etc.


With that long-winded intro having been said, my main question is this:

If we are running on the backup server and have our current main server
shut down, and then plug the new server into the network for testing the
cluster will replicate items from the currently live backup server into the
new test server's databases (it will be a restore of the main server and
identical in IP address, etc.).  Once we are finished testing, we will
disconnect the new test server and then bring up the current main server
again.  Will the transactions that occurred on the backup server while the
main server was down all replicate back to the main server even if some of
them also replicated to the test server when it was connected?

Any thoughts are appreciated...