The other day I was messing around on my guitar with open sus2 chords. So I was playing a Asus2 chord and thinking about voicings and inversions thought "what if I played the 2nd (a B) an octave lower". I did that and found that I was playing an Esus4. I tried the same with a Dsus2 - play the 2nd which is an E an octave lower, and how I was playing an Asus4.

Are these just different names for the same thing? Is there any significance to this? I found it interesting, but I don't know if it really means anything.