I would think that they'd just add onto the existing membership as that's what happens when you change your subscription option. You may want to contact Disney's billing department for a firm answer though.
Quote:
Account / Billing Support
Phone: 877-427-7744
Service Hours:
Mon - Fri: 8am - 6pm (PST)
Sat: 6am - 4pm (PST)
Sun: 10am - 6pm (PST)
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