Migrate Custom Page Sizes to New Mac

I have a MacBook Pro with Mojave and a new one with Catalina. I print a ton of posters (mainly through PowerPoint) on our Canon iPf-4000s and as such have a ton of custom page sizes I'd like to not to have manually recreate on the new Mac. I also have a TimeMachine backup drive of my old MacBook Pro as well.

I've read that the custom page sizes are located in: /Users/YourUserName/Library/Preferences/com.apple.print.custompapers.plist but that path doesn't exist. I've also looked at the Home directory's Library/Preferences/com.apple.print.custompapers.plist but that file doesn't exist there either. Perhaps that is due to most of these instructions are for older versions of MacOS like Sierra?

How can I move these custom page sizes over? This last of paper sizes surely has to exist somewhere, right?