Linking the application will give peace of mind that it is in the IRCC system, and, you will get updates if any movement in the file with GUs. Read the below post in this forum to know how to link your application. It takes weeks for some before successfully linking though. You only have 5 attempts limit in 24 hours.my UCI is unchanged.. did you tried with your new UCI? Actually I don't know how&why to link..
https://www.canadavisa.com/canada-immigration-discussion-board/threads/pr-card-timeline-etobicoke-office-only.712660/post-9450934