Will a 4.56 installation be able to establish a tunnel to a 5.21 version.

Will a 5.21 installation be able to establsih a tunnel to a 4.56 version

What happends If I have a server that is currently running a 4.56 version and we install the 5.21 version on the same server.  Will both versions co-exist on the same server peacefully or will the install process uninstall the 4.56 version.   in that last scenario will the tunnels already configured under versio 4.56 work under the 5.21 install?

Thank you

Guy Gaudreau