OCI Load balancer - Private & Public network

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I have one question regarding OCI Public load balancer. if I create a Load  balancer in the Public subnet and then there should be one Public IP associated with the Load balancer and we can access the Load balancer from the Internet. this is my understanding.

so my questions is , if I have few OCI compute instance running with in the same VCN where load balancer resides and if they want to talk to load balancer [assuming they are in the same subnet] then should all the traffic go through internet or can they talk each other using the private network of the same VCN?