What is the essential difference between dq7 and dq8?

Hello, Dragon Fight 7 is a game on ps, while Generation 8 is a game on PS2. However, these two generations have been remade on 3ds. In fact, these two games are very different. After all, they are two different games, but they are very different in plot and system. Although they have a series of consistent characteristics, they are really two different games.

hope to adopt it, thank you.