def trace(m1,m2):
    if not isSquare(m1) or not isSquare(m2):
        return False

    sum1 = 0
    sum2 = 0

    for i in range(len(m1)):
        for j in range(len(m1)):
            if i==j:
                sum1+=m1[i][j]

    for i in range(len(m2)):
        for j in range(len(m2)):
            if i==j:
                sum2+=m2[i][j]

    return sum1*sum2 == sum2*sum1

def isSquare (m):
    return all (len (row) == len (m) for row in m)


a = [[1,2,4],
     [2,0,4],
     [4,5,0]]

b = [[0,2,4],
     [2,0,4],
     [4,5,1]]

trace(a,b)