Simple question on fail over and config files

I have a primary and secondary running streaming replication with 9.2.
Primary posgresql.conf file is slightly different than standby server conf
file. If i create the trigger file to force the standby into primary mode,
is there a way to make the new primary server use a different config file
configured for a primary after it becomes the primary besides shutting it
down and loading the new primary config file? Or can we just leave it
running as a primary using the config file it used as a standby?

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Thanks,

Jorge Torralba
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