चतुष्पदद्विपदानामपि हि रूपलिङ्गसामान्यं भवति किमङ्ग पुनरेकयोनिद्रव्यकर्तृप्रसूतानां कुप्याभरणभाण्डानामिति ॥ कZ_०४.६.१० ॥
catuṣpadadvipadānām api hi rūpaliṅgasāmānyaṃ bhavati; kimaṅga punar ekayonidravyakartṛprasūtānāṃ kupyābharaṇabhāṇḍānām iti ।
四足の動物と二足の動物の間でさえ、形や識別標識が似ることがある。ましてや、同一の原材料から同一の作り手によって作られた加工品・装身具・器などの財は、なおさら似通い得る—すなわち見た目が同じになり得る。
That visual similarity is common; therefore courts must not rely solely on appearance to identify ownership of manufactured goods.
As an analogy: if even living beings can look similar, manufactured items from the same material/maker can be even harder to distinguish without corroboration.