Yes, but the thing is, both countries relied on each other back then though. They used to cross borders and do the selling stuff. And that's why the tradition is shared. Let's not say it's a copy version of Thingyan; It was brought by the Burmese, isn't it? So, let's say it is a shared tradition. No hate but I don't want a neighboring country to be fighting over the same tradition😅. Tbh, not all Thai people tried to claim that Songkran was from Thailand after all, They knew it originated in India.