I would like to install SSIS into existing MSSQL2014 Fail-over cluster instance with latest Cumulative update 7 which was applied. I know how to do it but I want to know if consistency of versions between SSIS (from installation disc) and MSSQL2014 (already updated) will be kept at the same latest server version (latest version is 12.0.2560). In to detail, I mean I have latest CU7 update applied but I want to install SSIS from image where is first RTM version release 12.0.2000 but currently I have 12.0.2560 CU7 Server version which is newer. Will be there conflict of versions or SSIS has no impact which version of SQL server is actually installed? I can also download image of SQL2014 with SP1, but build version is higher than actual CU7 (SP1 is 12.0.4100 build version and CU7 with fixes 12.0.2560 buld version). Reason why I don't want to install SP1 even when build version is higher has less fixed bugs than actual CU7.
So in result does post-installation of SSIS downgrade SQL Server version to which installation media contains or it will be self-upgraded to actual server installed version?
Thank you for help.