are ichibei and ywach two sides of the same coin? who's techniques are better than whom's?

isnt ichibei giving names and ywach imprinting souls with a letter, kind of same technique? we also see ichibei taking black(kuro-reishi) from stuff around the worlds and time to power up against ywach which looks similar to ywach's reishi abosrbing tricks.

also there're many similarities between techniques and fighting styles among different races. cfyow speaks about *spoilers* the concept of zanpaktou being similar to hollows's resurrection and being inspired the process of sealing ikomikidomoe into an asauchi/sword and ichibei naming it.