That being said, there's one exception you should be aware of: macOS 10.14 had a support for some of the older MacPro models with Metal-cable GPU - these are no longer available in Catalina. So if your device runs on Mojave, it will run on Catalina as well.
Click on "Disk Utility", select the disk with Mojave installed, and click "Erase". You can also press Command + R to enter the Recovery Mode. Restart Mac, hold Command + Option + Shift + R keys to boot into Recovery Mode. If your Mac is shipped with Mojave, you can directly downgrade Catalina to Mojave with below tips: Just so, how do I downgrade from Catalina to Mojave without losing data? Allow the Mac to perform a complete factory reset. On the “macOS Utilities” window, click “Reinstall macOS”. Restart macOS Mojave 10.14 and instantly press and hold Command + R keys. Back up all the data from Mojave to an external SSD or HDD. Likewise, how do I downgrade from Mojave to High Sierra? 1st Way-Use macOS High Sierra That Was Shipped with Your Mac 
Step 5: Restore data from an earlier macOS Mojave Time machine backup. If you’re one of those users who’s having trouble with macOS High Sierra and decided you’d rather go back to macOS Sierra, heres how.Terminal Code:sudo /App. Step 2: Create a bootable drive of macOS Mojave. Can you downgrade from High Sierra The process of downgrading from Catalina, Mojave or High Sierra to an older system like Sierra is a little more difficult due to differing file formats.Older versions of macOS and Mac OS X all use Apple’s HFS+ file format, while newer versions of macOS utilise Apple’s proprietary APFS file format. Important information for Macs with the T2 security chip. #How to downgrade mac os mojave to sierra how to
How to downgrade from macOS Catalina back to macOS Mojave
Likewise, how do I downgrade from Catalina to Mojave?
Click on Disk Utility in the macOS Utilities window. Hold down Command+Option+Shift+R to boot into recovery mode. 
Click on the Apple menu and choose Restart.Make sure your Mac is connected to the internet.
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