[Dovecot] expire db(s)?

[ben]

with two separate dovecot/backend servers accessing one central mysql 
server, will it be ok to have them both use the same expires table? Or 
will that confuse the actual
 dovecot --exec-mail ext /usr/local/libexec/dovecot/expire-tool.sh
cronjob since some of the entries mailboxes won't exist locally?
  Ben