If the SIP domain for IM/P and Lync 2013 are the same, then it will be an intradomain federation. Intradomain federation with Lync 2013 is supported however Cisco labels this as a migration solution rather than a long term solution. You might have to look and see how many users are on the Lync/IM&P and the load it puts on the server.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.