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Re:macOS Catalina by js2 on Monday October 07, 2019 @03:12PM (#21184779)
Should be possible:

https://support.apple.com/en-us/HT208891

I've done this to install a beta, but not to try to install an older macOS version from a newer release. If for some reason, the Mojave installer won't launch from Catalina, then you could create a bootable Mojave installer:

https://support.apple.com/en-us/HT201372

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