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UC1843-SP: Differences in die construction for the 5962-8670402VXA, UC1843AMDREP and 5962-8670409VPA

Part Number: UC1843-SP
Other Parts Discussed in Thread: UC1843A, UC1843

Can provide the differences in die construction for 5962-8670402VXA, UC1843AMDREP and the 5962-8670409VPA?  I would like to understand if the similarities and differences of the dies for the three referenced part types.