Is it possible to synchronize postsrsd rewritten e-mail addresses to another postsrsd machine?

I would like to use two mailservers for loadbalancing/failover - so one receives an e-mail and rewrites e-mail address with postsrsd. Then response to that e-mail is received with second mail server and this server needs to know, what was the original rewritten address so he can send the response e-mail to it. But this information is only on first original mail server.

How can I synchronize (and merge) postsrsd "database" to another machine?

Is it sufficient to set same /etc/postsrsd.secret key on both machines and will it work?