Regarding the stem, sometimes the length of the threads in the crown will vary, so when you screw the stem into the crown it will bottom out in order to tighten it - if the threads are deeper in the crown, it may cause the stem to be too short. If the threads in the replacement crown are shallower, then you can always trim the stem. When I'm swapping a crown I always have a stem handy in case I need to cut a new one to the correct length.
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