Hi @Karthikeyan Mani,
Welcome to Microsoft Q&A Forum, thank you for posting your query here!
In the question itself is stating that there was same operation name & ID but in result there was different item ID for those same operations, it means there were no duplicate entries in the data, because the Item can either have different telemetry info related to the operation.
Every telemetry item can define the context information like application version or user session ID.
ID: ID is the identifier of a request call instance. It's used for correlation between the request and other telemetry items. The ID should be globally unique. For more information, see Telemetry correlation in Application Insights.
Please refer to the below doc.
Application Insights telemetry data model - Azure Monitor | Microsoft Learn
Please let me know how it goes, we will always help as you needed.!