Is the upgrade procedure of NetScaler VPX instance installed from Azure Marketplace different from the on-premises upgrade procedure?
No. You can upgrade your NetScaler VPX instance in the Microsoft Azure cloud to NetScaler VPX release 11.1 or later, using standard NetScaler VPX upgrade procedures. You can upgrade either using GUI or CLI procedures. For any new installations, use the NetScaler VPX image for Microsoft Azure cloud.
To download the NetScaler VPX upgrade builds, go to NetScaler downloads > NetScaler Firmware.