comparing each rows of two matrix

[PhysChem]

I have two numpy-matrices ("A" and "B"). I want to compare every row-vector in "A" matrix with every row-vector in "B" matrix.

Here is my (not working) code. The expected output is 5.

import numpy as np
a=np.matrix([[1,2,3],[42,68,69],[1,2,3],[85,89,95]])
b=np.matrix([[42,68,69],[1,2,3],[85,89,95], [42,68,69]])


found_one=0
for i in range(3):
    for j in range(3):
        if a[i,]==b[j,]]:
            found_one=found_one+1
            
print(found_one)

Any suggestion?