From the information you've given us, there's no way of knowing if they're the same index or not.  If they have the same key columns and the same included columns, then they're the same.  If not, then they aren't.
The SQL for the creation of the indexes would be the clearest way to be able to answer your question.

The real question is about the statistics on them.  You said you created "one index sometime" but that doesn't say when.  If the NCI was created, then SQL Server created statistics for it.  As the data in the table changes, the statistics get to be out of date.  SQL Server uses the statistics to determine how to best execute the query.  If the statistics are out of date, then the plan for running the query might not be optimal.  Next time, check the statistics before creating more NCIs.