Recomendation for tool to test and compare API responses [closed]

We are migrating database from sqlite to DynamoDb. Migration includes update of code for REST API. I am looking for recomendations for tools that I can use for testing of REST API responses. Use case that tool should be able to do or provide ability for me to script:

1. Send request for old API endpoint
2. Send request to new API endpoint
3. Compare response from #1 and #2

From my preliminary research/google-search, it seems that postman potentially could be used for this testing. However, setup looked complicated and raised question if plain Python script would be better and cheaper option vs Postman. Since all API endpoints need to be tested for migration (work to add existing endpoints to the tool will have to be done), it makes sence to continue using this tool post migration for testing of any new work on API.

I was wondering if

1. Paid postman tool is gtool to use?
2. Are there better alternative to postman?

Thank you