If the frets are currently too low, taller frets will improve playability....even if the action remains the same. Installing taller frets does not automatically lower the action, unless the neck currently has excess relief that cannot be removed by adjusting the truss rod.
One thing that is certain....the nut will need to be raised after installing taller frets....unless it is too high now. The nut height should be in the same plane as the tops of the frets.
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