Yes, you can use them on a later visit. A few tips....
Be sure to ask that your Annual Passes be set as the first priority of tickets in your
MDE (ask them to do this at check in). that way using your MB doesn't accidently use the package tickets for entry and instead uses the AP.
Be sure to do the math before renewing your AP.....obviously if you're going to visit shortly after your current APs expire, then it's worth renewing, but if there will be a two or more month gap it may be better financially and time wise to let your AP lapse and get a "new" AP instead of a renewal. For example...if your AP expires in March, but your next visit is not until June (or later).....it would be better to let it lapse and get a new AP. The renewal is about $100 savings, but even that discounted AP price prorates to $49 a month...so if your renewal is more than 2 months after your last visit, you've pretty much washed your savings....but your renewed pass will expire again in March....whereas a new pass will expire in June (or later).