Based on the documentation below, AAD Cloud Sync does not support device sync as of now. So, if you have Azure AD Joined devices (not Hybrid) and your WHfB deployment is Cloud Kerberos Trust, you should have no issues with the migration, otherwise you cannot move forward with the migration.
Sync engines comparison:
Tool to check which sync engine best fits your current needs:
https://setup.microsoft.com/azure/add-or-sync-users-to-azure-ad
Thanks