Assuming you are using this for RemoteWebdriver, the version number wouldn't make any difference. When selenium hub receives the test request for a browser, it will compare all capabilities that was requested for with the remote control capabilities. If it doesn't find one that matches all capabilities, it will fail.
In your case, if you registered the RemoteControl with capability - browser browserName=chrome,version=30
then only the first option in your question will work.
Alternatively, if you are not specifying browser parameter then you need to hover over the browser image in Grid console and find out the version number.