SPD on AARS

Were the AAR Cudas only made on certain days? I’ve got two cars and they were both made on diff days but the vin numbers are far apart. I’m not looking at the tags but one Cars SPD is 409 and the vin is 3004xx. The other is vin number 2894xx and it is 331 if my memory is right. I have it’s tag in the safe at home. Did they make the TAs on the same day? I may still have a copy of the buildsheet of another one that I owned.

AARs & T/As were not "SCHEDULED" every day, but would've been on the assembly line just about every day during their production period
Hamtramck "SCHEDULED" ~1500 cars per day, so cars "SCHEDULED" 8 days apart would have "ASSIGNED" VIN sequence #s ~12,000 apart