If you are already running Mojave on your computer, then chances are Catalina should also be able to run.
But you have to test for yourself whether the Thunderbolt card if it will still work under Catalina (or any newer version of MacOS you want). Best to keep your Mojave installation and install Catalina or newer onto a new disk. If you have installation problems you may still be able to go back to your working Mojave.
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