The command swift is actually the swift CLI client.

So the version info is also about the client.

The devstack version will most likely install the newest source code. But the multi-node version is a distribution version of swift that released by Ubuntu. If you're using two installations separately, both of them should work because there're no dependency b/w them. You don't need to worry about it.

You need to check your configuration and Swift Ring due to the failure of multi-node installation.