AWS data transfer cost within the same region, but belonging to different accounts?

Question

It seems like data transfer costs from S3 to EC2 or EC2 to EC2 is free if they are in the same region.

Would this same apply if the receiving EC2 instance belongs to another company in a separate AWS account? For example:

Company X forms a partnership with Company Y to send A's data to the B

Company X's data is stored in an EC2 EBS, or in S3 in N Virginia

Company Y receive X's data in an EC2 instance in N Virginia

If Company X sends data from the EC2, EBS or from S3 to Company Y, is the data transfer costs still free? Or would Company X have to pay, and if so, what would the cost be?

Answer 1

As per AWS Documentation:

IPv4: Data transferred “in” to and “out” from public or Elastic IPv4 address is charged at $0.01/GB in each direction.

IPv6: Data transferred “in” to and “out” from an IPv6 address in a different VPC is charged at $0.01/GB in each direction.

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