Your client can use the same account but you should send an invitation for each year, so that those files can be linked to the respective tax years and the relevant tax documents can be imported correct, if you so choose.

A more organized and less cluttered Intuit Link account should also make the communication between you and your clients more effective.

If you haven't tried using Intuit Link as a client, you should give that a go.  Not only would that make it easier for you to guide your client when questions (like this) are raised but it will also help you plan the end-to-end logistic of your tax compliance process.