Other than Nirvana , what else is not changing?

It is said that Nirvana is not changing. But I found a text here which states that dharma of conditioned arising is unchanging. > The Buddha said to the monk: “Conditioned arising was neither made by > me, nor made by others. Whether a Tathāgata arises in the world or > not, this element of dharma remains unchanging. If sabbe dhamma anatta then how is it possible that Dhamma of conditioned arising is not changing ? And is it possible that Nirvana and Dhamma of conditioned arising are the same?