Photo ID cards for Indian cattle

I might be showing my ignorance here, but can you really tell cows apart in ID photos??
indiancattle

Indian border guards are photographing cows in villages in the eastern state of West Bengal and issuing them with identity cards, officials say.
Border Security Force (BSF) spokesman GK Sharma said the move was meant to stop smuggling of cattle from India to neighbouring Bangladesh.

BBC NEWS | South Asia | Photo ID cards for Indian cattle