What is System.Reflection.RuntimePropertyInfo and how do I compare it?

I was suprised to see that the actual type of the object I get with x.GetType().GetProperty("Foo") is not System.Reflection.PropertyInfo but System.Reflection.RuntimePropertyInfo.

I don't see this type documentation in msdn or elsewhere.

My actual problem grows from reference-comparing two properties. I receive a property from third-party lib and compare it with a property which I get with .GetProperty("Foo") on the same type. I expected properties to be the same object (and they looks like the same property in "Locals" window while debugging), but they are not (GetHashCode result is different). So, I think it can somehow be related with the actual type of the property object which is System.Reflection.RuntimePropertyInfo.

What is System.Reflection.RuntimePropertyInfo? How to compare it? Does it behaves the same as usual PropertyInfo?