I have a mix of digital and disk registered.
When Sims 3 was ending the local stores were selling disks cheaply so I purchased all of the expansions and stuff packs I had originally bought digitally with new disks.
When I got my new laptop in early 2014, pre patch 1.69, I installed Origin and installed my game using mostly the disks as it was faster that way.
I did not register any of the disks. So I still have the unused codes for all of the disks I purchased.
Later on we got patch 1.69 and I didn't want to be forced to patch to that level so I lived in constant fear that Origin would one day just do the update for me without my knowledge.
When I got my new computer in 2017 I did not install Origin. I did install all of my Sims 3 game using my disks.
The game works perfectly. Everything is just as it was previously on older computers.