No, the Pen Tablet pens are not compatible with the Pen Display pen at this time. That is something we are working on as a feature enhancement.
Pens:
The pen Model numbers for the Pen Display 16 are:
Thin pen v2: PH36 - Link to eStore: https://www.xencelabs.com/us/store/accessories/xencelabs-thin-pen-v2.html
3-Button pen v2: PH35 - Link to eStore: https://www.xencelabs.com/us/store/accessories/xencelabs-three-button-pen-v2.html
Nibs:
Black v2 Standard: XETPH36A: https://www.xencelabs.com/us/store/accessories/standard-nibs-for-pen-display-24
Felt v2: XETPH36A: https://www.xencelabs.com/us/store/accessories/felt-nibs-for-pen-display-24