This search will get you duplicate searches. You should be able to modify it to get duplicate names, although I'm not sure that's very useful.
| rest /servicesNS/-/-/saved/searches/ splunk_server=local
| search is_scheduled=1
| fields eai:acl.app title search | stats values(eai:acl.app) as app, values(title) as title, count by search | where count > 1
Keep in mind it's possible to have duplicate alerts where the search strings don't match as there is more than one way to accomplish the same task in SPL.
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