I used the standalone updates (Mojave 2021-003 / Catalina 2021-002) to install on my Mojave 10.14.6 and Catalina 10.15.7 installations. No apparent issues so far. Installed onto a test disk using my Kaby Lake system (Z270X-UD5 / i7 7700K / GTX 660) and then cloned the installations back to my other systems using SuperDuper. I use Clover 4920 for Mojave and Clover 5119 for Catalina.
Run the updater on Mojave / Catalina and reboot when requested. When the Clover screen appears choose the option with "MacOS Install". May need to do it more than once.
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