Moving Lightroom with sync'd collections

Upgrading to a new Macbook Pro. I used Migration Assistant from a Time Machine Backup and it worked perfectly.  So, now for Lightroom. My catalog and files are all good to go but I'm a Sync'd Collection power user. This is how I communicate with my clients and I currently have 40+ collections sync'd with about half of them holding selections & comments from clients. I know Lightroom Collections can only sync to a single computer so if I deactivate my old MacBook and sign into my new one (which is a perfect copy of my old MacBook), will I still have all my collections with Favorites & Comments from clients or will I lose all of that sync'd data??

I tried momentarily opening LR and it gave me a message about sync'ing 11,000+ files and so I shut it down!  It would be huge to lose all of that info but at some point I have to switch it over. The longer I keep working on the Old Mac the longer I prolong the beauty of my upgrade. If I could sign out of the old and sign into the new and keep all the sync'd info that would be amazing?  I just need to know if that Sync process will bring all the Favs & Comments into the new Computer or it it will erase all my sync'd files because it sees it as a new catalog?

Anyone know what will happen??