I don't see why not. You have a valid resort key with the dining on it, so I would think the restaurant would not care.
BTW, I did the same thing. I was worried too, but then when I went to check on my resort confirmation online. I entered my confirmation number, then went to the page to check my ADRS for the meals I didn't use my confirmation number with when I got them online, and somehow they are now linked to my resort confirmation number.
Yow can always call the dine line and ask to have that ADR linked to your resort confirmation.