Welcome to the Community,
While VMware Player and VMware Workstation use the exact same format for their files, ESXi uses a slightly different format. Even though you can download the files from the ESXi host's datastore and reconfigure the VM (the network settings are different), the best option would be to use VMware Converter to do the job.
If the VM's will have access to the same network, you may need to do additional modifications (individual MAC addresses, computer names, ...)
André