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Both are correct - its the same underlying data, just with different keynames for the values. They are different because in the first case you are accessing the cinder API directly. With the latter, list-volumes is a request to the Nova API which then calls the cinder REST API and proxies the data back. However in doing so, it slightly transforms it, changing the keynames in some cases to CamelCase rather than snake_case.

In the Nova V3 API os-volumes interface is removed and it is expected that clients will just access the cinder API directly (there is no advantage in going via Nova to get the same information).