You should either remove the previous identity from the default location (take a look on https://documentation.storj.io/dependencies/identity#backup-the-identity where is it located depending on your OS) or use a new name for the storagenode, i.e.
identity create storagenode2
identity authorize storagenode2 authtoken2
identity create storagenode3
identity authorize storagenode3 authtoken3
and so on.
identity create command will create a folder with such name (storagenode2, storagenode3, …), so you can then transfer them separately.
Also, if you use the same external address (or the same public IP) or if you actually runs them on the same PC, you must use a different external ports for the dashboard, i.e.
-p 14004:14002 and so on). But I wouldn’t recommend to publish your dashboard to the internet without protection. It’s much better to use the ssh tunnels instead: https://documentation.storj.io/resources/faq/how-to-remote-access-the-web-dashboard