comparing each rows of two matrix

[PhysChem]

The only idea I have:
Transforming the matrices into two lists, and a nested for cycle...

a_lista=a.tolist()
b_lista=b.tolist()
#"a" and "b" were my previously defined np.matrices
for i in range(4):
   for j in range(4):
      if a_lista[i]==b_lista[j]:
         print(i,j,a_lista[i])

Unfortunately, my "solution" is realy crap, because I want to use this on far bigger matrices :-(