Projecting grid intersection points onto surface above

Hello experienced !!
i have two topography surfaces and i want to compare the differences in them, thats why i placed them one above other. someone suggested me that by creating grid mesh by dynamo, getting its intersecting points and projecting it on surfaces could solve the problem. as the point projecting on both surfaces will be having same X,Y but different Z and therefore i can get difference.
is it possible this way? i created grid and got grid intersection points by dynamo but i dont know how to project it.