Hello Pedro,
Hope you're doing well.
Unfortunately, it is not possible to import Exceptions between modules.
What you can do in this scenario is to add an Output Parameter to your NewRequestCreate Server Action and assign a different value to it according to the Exception that was thrown.
As an example of what I'm referring:


Back to your Reactive module, you can evaluate this defined Output Parameter and handle it accordingly.
Hope that this helps you!
Kind regards,
Rui Barradas