As long as they are still valid (not expired). Take tickets to gate, and they have a procedure to follow. They take one day off per day. Since you say they are hoppers, you will get hopping on the one day ticket.
It won't give them access to Magic Morning, so if you guys have that on your tickets and are NOT staying onsite, you need to take that into consideration. (if you're staying onsite that gives you access to MM as long as you have a ticket, so no worries about their one-day tickets)