A multidimensional array can be used in linq as one dimensional enumerable. You just need to check also for the length of all dimensions. This snippet should be enough:

var equal =    data1.Rank == data2.Rank &&    Enumerable.Range(0,data1.Rank).All(dimension => data1.GetLength(dimension) == data2.GetLength(dimension)) &&    data1.Cast<double>().SequenceEqual(data2.Cast<double>());

You can flat a multi-dimension array with .Cast<String>

Console.WriteLine("2D Array");String[,] array2d = new String[,] { { "A1", "B1" }, { "A2", "B2" } };foreach(var s in array2d.Cast<String>())    Console.Write(s + ", ");Console.WriteLine("\r\n3D Array");String[,] array3d = new String[,] { { "A1", "B1", "C1" }, { "A2", "B2", "C1" } };foreach (var s in array3d.Cast<String>())    Console.Write(s + ", ");

Output

2D ArrayA1, B1, A2, B2, 3D ArrayA1, B1, C1, A2, B2, C1, 

A generic extension method to compare 2D arrays:

public static bool SequenceEquals<T>(this T[,] a, T[,] b) => a.Rank == b.Rank    && Enumerable.Range(0, a.Rank).All(d=> a.GetLength(d) == b.GetLength(d))    && a.Cast<T>().SequenceEqual(b.Cast<T>());