Short answer to the original question - Yes.
you may use up to three credits from previous reservations to pay for a new reservation. To use a credit, you have to know the confirmation number and the name on the credit card used to buy the original ticket. If you have that information, and in your scenario you would, you can easily apply the funds to a new reservation.
I do it all the time.
Steve
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First visit: Disneyland, July 17, 1955 (well, somebody had to be there on opening day!)
Next visit:
Nov 23 - Dec 2 AS Movies
Dec 2 - Dec 11 Boardwalk
Most Recent Visits:
WDW - ICOT15
Disneyland - Labor Day 2007
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