that's right 与that's OK的区别?

根据实地经验，在美国口语中：
that's right = 你说得对
that's ok被人经常挂在嘴边，标示“没有关系”
EX：
--- do you mind if I turned off the light?
--- that's ok~just do it~

that's right.表“是的”“对的”“没错”
that's OK = that's alright
表“好的”“没问题”

That's right。
那是右边。

That's left.
那是左边。

that's right：是，对
that's ok：好，可以

不过这个是英语问题，怎么发到日语区来了。。。

没有区别。