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So, I was having the same problem with a 2015 MBP running 10.14.6 and a 2019 MBP running 10.14.5 and this is what solved it for me:(1) Perform a TIme Machine backup of the older machine running the newer OS (10.14.6 in my case)(2) Boot the newer machine running the older OS (10.14.5 in my case) into Recovery Mode (hold CMD-R during startup)(3) Connect the Time Machine drive to the new machine and select "Restore from Time Machine Backup"(4) Follow the prompts, wait for a while and if everything goes smoothly, you should be able to login to your new machine which will now be running the same OS as the older machine. Your documents, applications, etc., will all be exactly where they were on the old machine.Bit of extra info: In my specific case, the Time Machine restore failed because I had a specific troublesome file (a changelog for iThoughtsX). I removed the problematic file from my 2015 MBP, made a new Time Machine backup, and then the restore process went off without a hitch on the 2019 MBP.Hope this helps someone.