Provisioning disks comes with the caveat that on AKS, Kubernetes sees things one way, but Azure bills you in some bizarre, Azure specific unit of disk space and speed and then there’s whatever the hell goes on with the pricing / units on the SQL Server instances...
Ah, you'd be talking about DTUs! Those are fun. Blended measures of CPU, IO and some other Magic(TM) factor. Impossible to predict how your workload maps to DTUs until you try it and see.
And Cosmos DB? 'Request Units'? W. T. F.