If you purchase the add-on directly from Disney, it will have the same use year and will be under the same member number. However, you can not pool the points at 11 months, you must wait until the 7 month booking window to pool the points. During the 11 month window only the points from each resort has home resort booking privileges, so you could use your AKV points at AKV and your other points at their respective resort. At 7 months, points are points, no matter at which resort they are owned.