Calendar category sequence numbers

Here’s a question that might brighten up an evening’s Trivial Pursuit:
Can the Sequence numbers in a calendar category be duplicated?
repeventscdr12cat9

When I make new ones I’ve been arbitrarily making them the same as the category number, in keeping with what I observe is the custom in the default categories. But is that necessary?
Can I have duplicate sequence values? Particularly multiple '0’s ?
Could I have the same sequence values on the Patient list of categories as are on the Provider list?
Thanks in advance for the edumacation!
Best- Harley