Fusion and DaVinci Resolve Dongle vs Codes

Hi everyone, I'm sure this has been asked many times but I can't find the answer.
Does anyone know the most efficient way of upgrading to Studio – will the Resolve dongle cover Fusion 16?
If so that sounds like a good reason to go for the dongle.
I understand that the code option means that you can install on two machines – but I'm guessing that this would mean just activating Resolve (or Fusion). Is this correct? Or can a licence code for one activate the other?
Thanks again in advance!
D
Does anyone know the most efficient way of upgrading to Studio – will the Resolve dongle cover Fusion 16?
If so that sounds like a good reason to go for the dongle.
I understand that the code option means that you can install on two machines – but I'm guessing that this would mean just activating Resolve (or Fusion). Is this correct? Or can a licence code for one activate the other?
Thanks again in advance!
D