Old and new design are completely different, border, artwork, etc.
Question 1, I am assuming they are different cards, can you have both in your deck per 50.
2nd question, someone else used my deck while I was showing them how to play and something I didn’t expect was both Emperor Nero show up at the beginning and he put them in play at the same time. Can they both be in the territory if they have the same name but he said they were different cards. (He caught on quickly, it made me question it myself) so here we are.