provisioned size with vmfs3 or NFS

I had a server with server snapshots. The snapshot did not get deleted after a shapshot delete in the snapshot manager.

So I made a clone to a datastore, (vmkfstools -i source dest -d thin). Is was done on a NAS based on the nfs filesystem. That worked.
The vmdk provisioned size is 78GB and the actual size is 34GB

When I copy the vmd to a scsi datastore (where it must run) and i go th the harddisk in the virtual machine properties I see a provisioned size of 74.5GB and a max of 273.21 GB

Why is the provisioned size after the copy to th vmfs3 (hp seral attached scsi) bigger??
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