Everytime I see a thread like this or here someone ask this question,I remember when I was driving to Metropolis Ill.ASA shoot and 2 big deer come running down the side of the road.They looked identical,probably twins.I thought to myself then,wonder how many times 1 was mistaken for the other.

So to answer the question,no way to know for sure.

If you had 1 with character,might be easier to tell then.