Two Z-wave sticks in one HA instance

Sure, you can export your driver cache from ZUI and import it into the core-addon. Effectively, you’ll need to do the reverse of Switching Z-Wave JS Addons with Minimal Downtime! Z-Wave JS (Official) to Z-Wave JS UI (Community) but it’s fewer steps. I can’t really spend the time to create a guide to do that, but the core add-on exposes the cache directory to users so you can directly copy the files over after installing. Feel free to drop by the zwave channel in Discord if you need more guidance.

If you have another server though, it might be easier to install Z-Wave JS UI there and connect to it remotely via HA.