If you're referring to the order of notes, A-C#-E (1, 3, 5) and A-E-A-C#-E (1, 5, 1, 3, 5) are both an A major chord.
The second one is an inversion (don't ask me which) with some added octaves (A and E). This is common for guitar, since it's not always physically possible to fret the notes in order. If a chord doesn't sit quite right, sometimes substituting an inversion will work better.