How cold can conifer seeds be subjected to?

Are conifer seeds as zone hardy as the tree?

Or are they even more cold resistant than the tree itself?

i keep seeing on the web these ideal temps for cold stratification in the refrigerator of 34-40f for various seeds and some sites even say ' DO NOT PUT IN THE FREEZER!!! ' but they must have to be able take freezing temps when they are from a tree that's zone 2 or 3 tolerant? Don't they?

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