opengl - LookAt Matrix Question - when are they equivalent -

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Can you please confirm or reject the following statement that is correct to me?

1) Two Lookout (eye, center 1, above)

and 

  glLookAt (eye, center 2, above)  
  glLookAt   
 are equal if  center1 - eye == k (center2 - eye)  for some positive Kashmir  
 2) tho lookAt matrices are never equal if their  eye  vector is different   
 
 
 
 is equivalent if cent1 - eye == k (center2 - eye) for some positive.   
 That's right. The direction vector is calculated by the center - with eyes, and then normalized, so if the direction is the same then length does not make any difference.  
 Be careful that there may be very slight numerical differences in the matrix as the circular circular, though for all practical purposes, the matrix is ​​the same.

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