Is it possible to rekey an Andersen exterior door with Kwikset SmartKey?
To answer the question: It is almost certainly possible to get a replacement cylinder for your Andersen door which accepts the Kwikset keyway, and have it keyed to accept the same key you're now using on the front door... or reset the front door to respond to the key the new cylinder ships with. My storm door uses a Euro-style cylinder, which is uncommon in the US but a good locksmith ought to be able to handle this request.

As others have said, though, I'd replace the SmartKey cylinder while you're at it. They were a nice idea, but they really have proven to be less secure than I'm comfortable with. A replacement cylinder should be cheap, and rekeying it doesn't add that much cost.