It appears that they're using different chemistries, so they didn't copy LithiumMoto. LithiumMoto advertise NaMnPoCO cells whereas Ohmmu say they are using NaFeO2. LithiumMoto are certainly throwing shade Ohmmu's way by calling their NaFeO2 chemistry inferior, though ("We use 2nd generation Sodium chemistry NaMnPoCO,
beware of other suppliers offering older 1st gen NaFeO2 sodium"). I'm not a chemist or in any way qualified to weigh in on the advantages and disadvantages of those chemistries. I found this article, which is almost entirely over my head, but does seem to point to extremely fast degradation in the NaFeO2 chemistry:
Research progresses in O3-type Ni/Fe/Mn based layered cathode materials for sodium ion batteries - Carbon Neutrality
