i am wonder are tapas and line webtoons connected in some way has it seems to be running the same layout and software?
No I'm pretty sure they aren't tapas is independently owned but line webtoons is owned by a parent company.
Webtoon is owned by LINE, while Tapas is it's own company. The only similarity they share is how they are both comic-sharing platforms, but they aren't the only ones. There's Lezhin, Comico, Pixiv, and etc.
Nope, no connection. They are completely separate companies.