another thing is that it takes time for the voicings to comfortably "sit" in the hands. Once that happens, the sound will change even though the notes might still be the same. This is because you are more comfortable with the voicing. Just like guitar win trying to play those pesky bar chards. If you are new to the instrument it is really hard.
Also, double check that you have all the right notes in the voicings and not playing too low
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