More like trillions! While statistically there may be duplicates of snowflakes, on a practical level there will virtually never be a match if you were to stand out in a snowfall with a magnifying glass for hours!

With some simple to collect tools you can make ice crystals grow in a bottle, did you know that? They will not fall like snowflakes, but they mimic the same growth patterns!

[The trick to dealing with Sho, as Jack has stumbled upon, is to direct his maths at something you care about.]