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Main concern of course at the moment is Catalina, the past few years Apple has made it virtually impossible to restore a previous system from an older OS via Time Machine!
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What has time machine got to do with anything? **If** this OS ran on the new 16" MBP then you just run the installer and build a USB flash stick installer or add a new disk partition to the internal drive (actually APFS Container) and do a full clean install of Mojave to that partition/container. That way you would keep Mojave and Catalina as bootable partitions, which might be useful for testing/running other software.
Relying on Time Machine to do system level backup restores is likely not a good idea to start with. I would much rather Carbon Copy Clone the boot container/partition onto (several) external drives. That can get you recovered and running in the time it takes to reboot the computer.
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Originally Posted by Meads
Can't you boot from a drive with a Mojave installer, wipe the Catalina drive and install Mojave? I have no idea, generally curious.
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Yes. Exactly. Or not wipe, your choice. But only **if** this computer supports Catalina, which the starting assumption should be it does not.