Hi Martti,
This should not be a problem : the new services will be added to the list of services with the new names. That’s what's expected so you will be able to use and start both services on 14.3 and 14.4.
Ensure you remove your NIKU_HOME environmental variable or/and always navigate to $clarityppm/bin if you want to run commands on the services.
If you only plan to use your fresh 14.4, then you should navigate to $clarityppm14.3/bin and remove the services manually from there with command service remove all.
Hope this helps -Nika