Note: a major chord is made of three notes and a 7th chord is made of four and since a guitar has six strings some of the notes are bound to be 'doubled' one or even two octave higher. Also, due to the way a guitar is tuned, the order of the notes may be 'mixed up'. This doesn't change the kind of chord we play: an E7 is 'made' of E, G#, B and D an A minor must contain A, C and E regardlesss of note doubles and order. What changes is the texture of the chord: what is the higher and lowest note, which strings are open or fretted al influence the sound of a chord and so the more shapes we know of a particular chord the best we can refine our playing style.
So why not have some fun with minor 7th chords?
We can use the same technique to find two more fingerings for the E and A minor 7th.