We have two lists with plot: ( Because they are not very short we uploaded list1 and list2,here and here)

In some regions the values related to the z axis of list2 gets exceeding from the values related to the z axis of list1. We specified these regions with red color.

Main Question: Because we have data and not functions, we could not use ContourPlot to show these areas. How can we present these zones in a 2 dimensional plane.

Second Question: We exploited

Export["list1.txt", list1, "Table"];

and

read = Import["list1.txt", "Table"];

to save and read data. But in importing, we think Pi will not be imported in a suitable format. How can we import data which contain Pi as $ \pi$ ?