Indeed looking at decimals shows that XZ sketches aren't perfectly mapped :
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>>> App.ActiveDocument.Sketch001.Placement.Matrix #XY
Matrix ((1,0,0,0),(0,1,0,0),(0,0,1,0),(0,0,0,1))
>>> App.ActiveDocument.Sketch002.Placement.Matrix #XZ
Matrix ((1,0,-0,0),(-0,2.22045e-16,-1,0),(0,1,2.22045e-16,0),(0,0,0,1))
>>> App.ActiveDocument.Sketch003.Placement.Matrix #YZ
Matrix ((0,0,1,0),(1,0,0,0),(0,1,0,0),(0,0,0,1))
But at least it shows that there is something special with it.