I've messed around with those chords the same way a while back when I first started learning about them, and I found out (with the help from a wikipedia-article) that sus2 chords are the First Inversion of sus4 chords. For example, a Gsus2 has the notes G, D and A, while a Dsus4 has D, A and G. Likewise, sus4 chords are the Second Inversion of sus2 chords.
Basically, you can just call it whichever name you want. It will still be the same chord (although you can alter the voicing by moving a note up or down an octave).
I think that's basically it. I'm not exactly an expert though. That would be Christopher Schlegel :cool:
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