I’m not intimate with all the details of lapsed patented designs and cross-licensed designs but I’m pretty sure the part numbers you mentioned have all expired their OEM copyrights and unless guaranteed by design ( not tested) these specs must be universal for each package. Construction and protection may vary.
These guaranteed specs are the details defined in the datasheets in tables with environmental and process limits, while the graphs for nominal are not guaranteed. They apply only to the manufacturer and the Design Engineer must ensure any alternate source in the “approved parts and suppliers list” aka AVL , —the new must meet your design requirements. You cannot always assume, even if most are the same.
The exception is if you know there is no critical difference in your requirements, you may specify any source, but pro’s take sub’s seriously.
Enforcement is only by specs, PO’s and the buyer’s financial clout.