1974 build sheet

I have a 1974 Dodge Dart Swinger, (not all original), however the interior is mostly so. I found the build sheet under the rear seat, and was very excited as it was very readable. It is for a 74 Dart with almost all of the same items as mine, however it has a different Vin number. It is a St Louis plant car, and I was thinking maybe they were building two of them and the build sheet got switched by mistake. Anyone have this happen before? Gray
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