SQL Server license from AWS Marketplace with ? cores

We are planning to buy a SQL Server 2012 Enterprise edition license from AWS Marketplace for our company. We have exhausted our previous licenses and we need to add a new region with SQL Server in cloud. This SQL instance will be in peer-to-peer replication with SQL instances in other regions. I also found Microsoft certified vendors who sell these licenses. These vendors clearly specify the number of cores for which SQL edition is licensed. In AWS Marketplace though, I don't find the number of cores specified. Does that mean if I use a R5.2X EC2 instance to host this SQL edition, it will be licensed (and billed) for 4 physical cores and if I use it in a R5.4x EC2 instance, it will be licensed(and billed) for 8 physical cores? If anyone has experience buying SQL Server in AWS Marketplace, please advise. Thanks in advance!