It is said和it has been said都是据说,有什么区别吗?

it is said that固定搭配 记成个词组“据说”就行 就是据说的意思
it has been said that 表示 据说它……
再例如 she has been said that .据说她怎么怎么样了
而it is said that 只有这一种 固定词组
时态不同

It is said表示一般现在时，而it has been said表示已过去的，已经完成了的。