If by version you mean Steam vs Jast?
-No, content wise there's no real difference, some people just seem to have problems launching one or the other.
If by version you mean Kinkoi: Golden Loverich(base game) vs Kinkoi: Golden Time(extra/sequel content) ?
-Technically no but if you want the full story yes. You CAN play the Golden Time without ever having played Loverich but you'll be missing out on a ton of context as to who the characters are, what their relationships with each other/mc are like, what the world is like, and why certain things happen or matter. Plus the smaller extra routes in this game are just extra scenarios for the full length routes in the original game, they may feel overly short/random if you've never played the original and therefore lack context.