1973 Dart Sport Broadcast Sheet Question

Not a waste of time at all.

The VINs are close, so the two cars may have been very close together on the assembly line.

I have heard of Duster sheets found in Challengers & Challenger T/A sheets (two different VINs) found in the same AAR Cuda.

Have you searched the other possible locations for more sheets yet? If not, you may still find one or more that match your car.