Corrected entry: The computer on board the ship mistakes David for Walter. This makes no sense as while a human being could be fooled by his appearance or his voice, a computer with detailed sensors and possessing the exact details of David's composition would not be fooled simply because the two "look" and "sound" alike. In fact, Walter, being a newer and more advanced model, should be composed of different chemicals and materials than the earlier manufactured David making it even less likely that the ship's computer would have mistaken the two.
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Correction: Makes way too many assumptions about the manufacturing of either one.
Furthermore, we do not know exactly how the ship is supposed to be identifying the androids in the first place.
Quantom X ★
I feel like I already corrected a similar mistake. David is less advanced, but cleverer than Walter. The correction is right in saying there are too many assumption being made. Who knows what David did to be more like Walter, that might even be easy for a highly advanced android. Who knows how advanced and sophisticated the computer sensors are to detect an imposter android. I didn't think the computer or anything much is made with many defenses against sabotage. Its a peaceful universe. Also don't really remember but the first time David enters the ship couldn't he already have modified the computer? Hacked it?
lionhead
Well, we do know that Walter is constructed much differently that David. David uses what he thinks is an android-lethal move on Walter, and David thinks he has killed Walter. Moments later, David is astonished to see Walter not only alive but ready to do battle again. At this point, Walter even says, "There have been a few upgrades since your day." Which means that Walter is different in ways that even David didn't imagine. So, the original post is correct: Even a cursory security scan of David would have instantly revealed that he wasn't Walter.
Charles Austin Miller