My definition of alike (as pertains to snowflakes) is this:

Do they look the same when you hang them on the Christmas tree?

If you wish to be more technical, it's this:

If I put the two of them on a light table, does a piece stick out?

For me, statistics needn't come into it.
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Here's another bad statistic.

"Twenty percent of the people do all (or 80% of)the work."

How would anybody ever verify that? I suspect this of being made up by a self-justifying workaholic.