Is it possible to use a multiple instances of the same IdP within the same Genesys Cloud org?

Yes. To use multiple instances of the same IdP within the same Genesys Cloud org, you need to use a different Relying Issuer URI for each single sign-on integration. Having a unique Relying Issuer URI for each instance of the integration allows the IdP to distinguish which integration initiated the request.

For more information, see Add multiple single sign-on providers to Genesys Cloud.