Welcome to the Community - It sounds like you did not take into consideration the VMware feature called Transparent Page Sharing - the ability of the ESXi host to recognize that VMs are trying to share the same page of memory and rather than store multiple copies of the same page it will store it only once in Read Only Memory and if the goes to write to that page it will move it to its own space - so if you are running the same family of OS you can see how memory will be freed up -
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