You can sign into the same Pandora account on any computer or supported device, as long as you use the same email address and Pandora password.
However, you won't be able to listen to that same Pandora account on multiple devices at the same time.
Unlike broadcast radio, which all drivers hear in the car at the same time, each internet-connected device used to access Pandora receives its own unique stream of personalized music. Similar to other online streaming services, our music licenses limit our ability to stream from a single account on more than one device at a time. As a result, your subscription to Pandora Plus, Pandora Premium, or Pandora Premium Family will only cover the cost of one stream to one device (per Pandora account).
I hope this helps. Let me know if you have any other questions.