The login banner will work to identify the two different TMS instances, version 13.x and 14.x while you're setting up the new 14.x instance.
Because both servers in a redudant setup use the same SQL database on the back end, you can't use the login banner to identify each individual TMS server. What you could do is edit the TMS logo image in the top left to reflect the proper server. The file is "/tms/styles/default/images/logo.png", however this file might be overwritten whenever the server is updated to a new version of software.
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.