Does services in 2 amazon accounts connects over internet?

The so-called Internet does not pass through. Communication between AWS services is considered to go through Amazon's global network.

A VPC FAQ asks, "Does traffic go over the internet when two instances communicate using public IP addresses, or when instances communicate with a public AWS service endpoint?" The answer is as follows.

No. When using public IP addresses, all communication between instances and services hosted in AWS use AWS's private network.

https://aws.amazon.com/vpc/faqs/?nc1=h_ls