I remember @Mirimir confirming that canvas fingerprints between host and guest differ. That makes sense because one can access the real hardware while the other cannot.
What I want to find out is whether all users of a given hypervisor have the same virtual GPU fingerprint. This is important for users who use VMs for regular clearnet browsing and also use Whonix. Its important to know if an adversary can compare data once a clearnet vm is fingerprinted, with what they collect inside a compromised Whonix workstation to confirm its the same person.
OS Diversity is Crucial for Compartmentalization Safety
To test this you need:
To run plain Iceweasel in Whonix and visit https://browserleaks.com/canvas. Repeat the same with Iceweasel in Whonix on another physical machine and compare values.
A good result is if you see the same numbers for both machines. That means the virtual environment is uniform for all Whonix users.