Post installation of SSIS for existing SQL Server instance with different build versions
I have answer for this question from member of Microsoft Technet called Lydia Zhang:


  ...SSIS will inherit the patch level that your installation media contains, which has no impact on the patch level of your existing SQL Server 2014 failover cluster instance...
  https://social.technet.microsoft.com/Forums/en-US/83f5eef4-bf7a-439e-8e6c-a3124434b12d/post-installation-of-ssis-for-existing-mssql-instance-with-different-build-versions?forum=sqlsetupandupgrade


So my question is resolved.