Dear Ken and Board,
I strongly believe the two coins are products of the same die pair. Striking pressure and angle, die polishing,
smoothing, and/or tooling, in combination with the corroded surfaces of the top coin, can all account for the superficial differences between the two coins. I also get the feeling that the top specimen was struck at least twice over another coin---over two millennia after the fact.
Best regards,
Mark Fox
Michigan