When I boot my Mac from that external SSD, I can use it to test out Catalina. I have actually done all that "kind of" in reverse, where I have done the installation of Catalina on an external SSD, then migrate/copy needed information. (I usually have 2 more tasks to do after that completes: install the new, Mac OS specific version of Onyx, and make the TechTool Pro eDrive). When I restart the Mac, I have that new Mac OS, along with all my apps, settings, etc. from that just completed backup, and away it goes. Finally, I am offered the opportunity to migrate/copy needed files, folders, settings, etc. That does a full, clean, "virgin" installation of that Mac OS onto the internal SSD. Next, I boot from that SuperDuper! backup, use Disk Utility there to Erase and Format the internal SSD on the respective Mac, navigate to that (copied) Mac OS full installation file, and launch it. After doing one final cleanup of my current system (and that new Installation file will be there), I make a SuperDuper! backup. I always download the full installer, stop the subsequent installation process, make a copy of that installer file in another location on my machine, and then remove the one that landed in the Applications folder. For the subsequent installation, it is NOT required to have a prior Mac OS on the machine. If one instead downloads the FULL Installer, that is NOT done through that Preference pane. So, when that is downloaded, the installation process begins immediately, and updates the prior "eligible" Mac OS to the new one. Via the Software Update Preference Panel, one is downloading an update of the new Mac OS to the prior one. Click the button to install, and when a window appears, click "Continue" to begin the process." Open up the App Store in your current version of macOS, then search for macOS Catalina. You can download and install macOS Catalina from the App Store on your Mac.
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