Just clarifying @petercooperjr's response:
The 5 Duplicate Certificates Per Week is an API Rate Limit, based on a 7 day rolling window. The Certificates are not revoked and have 90 day expiries - so you can conceivably request 5 identical Certificates every week within those 90 days and they are all active.
Doing that, however, is generally an anti-pattern. You should re-use Certificates across servers whenever possible.
Can you share more details about this need? I didn't really think of this before, but this is generally odd and there might be an anti-pattern involved in your use-case we can help you get past. There aren't many situations where someone would need to have 2 active identical Certificates with different keys - but there are some edge cases where it is definitely necessary.