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How to find the permutation matrix associated with the similarity transformation in the following code

m = matrix(QQbar,6,[2,-1,-I,0,0,0, -1,2,-1,0,0,0,i,-1,3,-1,0,0, 0,0,-1,2,-1,0, 0,0,0,-1,2,-1, 0,0,0,0,-1,1])

j=matrix(QQbar,6,[2,-1,0,-I,0,0, -1,2,-1,0,0,0,0,-1,2,-1,0,0, I,0,-1,3,0,-1, 0,0,0,0,1,-1, 0,0,0,-1,-1,2])

the matrices m,j are similar via a permutation matrix. How I can find that matrix.