Difference between 70's and 80's coils.

The reason I posted this is cause of Rick's Ebay listings on ignition stuff was saying that his coil was true Mopar speck....so I just started researching stuff just trying to learn.

Then I noticed that the part number changed to a different number and wasn't using the term superseded like they were just plain different and not just a new part number change going forward.

Anyways....thanks.