Here's a poem I wrote that uses two verses comprised of exactly the same letters in the same order:
Plantagenet, I call you the ardent wine. ‘Dounce’ plebby kindred.
Swill or dainties pass.
Able truth.
Plant a genetically outheard, entwined ounce (pleb) by kind reds.
Will ordain ties. Passable truth.
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Invented by and named for Alexander Dounce, a Dounce homogeniser or "Douncer", is a cylindrical glass tube, closed at one end, with two glass pestles of carefully specified outer diameters, intended for the gentle homogenization of eukaryotic cells.