Hi,I have a question regarding integration and the question is say I have to integrate two salesforce orgs,is sandbox org and production org can be integrated
It can be two separate Salesforce orgs either sandbox or production it doesn't matter and you should be good to establish connection between different orgs.
You can use Named Credentials, API's, connected app between two salesforce orgs.
Check below examples that can help you.
https://jayakrishnasfdc.wordpress.com/2021/01/24/integration-between-salesforce-orgs-connecting-2-salesforce-orgs-using-named-credentials/
http://akashmishra.co.in/salesforce-salesforce-integration-using-rest-api-callouts/
https://salesforceprofs.com/salesforce-to-salesforce-rest-api-integration/
Salesforce to salesforce
https://help.salesforce.com/s/articleView?id=sf.business_network_intro.htm&type=5
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Thanks,
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