It is not likely that they could be used interchangably. The reason is the narrow radio spectrum that is used and the desire for such companies to produce proprietary pieces.
It is is possible if you were to get a Fob for a 4103 off Ebay for example, they could be resynched. But the remote start is going to have a different signal than the remote door lock. just so they can be operated independent of each other. So it is not likely the 2101 would do more than sync to the door locks.
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If anyone has this problem in the future, I just want to let you know that all avital 474l remotes are interchangeable. i found a website with all the replacements listed.
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