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Looking at a 66 - is there a way to identify if the differential in the car is original to the car?

I know about the casting # and the 2 digit code on the axle tube, but are there any other numbers tying the differential to the VIN of the car?
 

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No VIN but there should a Julian date code that should be dated prior to your build date by usually 2-6 weeks.
Located near the axle code, it may be lightly stamped like mine.

910BAB7B-5DEC-4F20-AF31-1C3102BECDA0_1_201_a.jpeg
 
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