Yes, both the Sandbox environment and Production environment use the same data, however, the data on our Production environment is more up to date.
We update the Production environment first to ensure that our Partners have the most correct data being displayed in their live environments; it can take some time for this data to be trickle down to our Sandbox environment.
If you are noticing a difference between the data in Sandbox versus a Production instance this is possibly the cause. If you still have some concerns please let the Partner Support team know.