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Sus2: R 2 5 R 2 5 R
-M2- -P4- -P4- -M2- -P4- -P4-
Sus4: R 4 5 R -P4- -M2- -P4- R 4 5 R
This means the chords are basically equivalent, simply using a different root note. 2nd inversion sus2 is a sus4, while 1st inversion sus4 is a sus2. Below we see that Gsus2 and Dsus4 consist of the same notes.