How do I test API in two different environments simultaneously

Hello Community members,

My question is... How to test an API in two different platform/environment (suppose in a migration project from old platform to AWS I want to test the API responses both in the old and new platform at the same time) at the same time and compare the responses with the old one? can I perform this kind of task using ReadyAPI or do I need any other tool/application?

thank you.....