Steps to reproduce
1. VMWare Templates for Zabbix version <4(e.g. 3.0 downloaded from share.zabbix.com) are already present in zabbix;
2. Attempt to Import VMWare template(Zabbix official VMWare template from Git) for Zabbix version >=4 (Template Import configuration is default, screenshot attached).
Both templates are attached.

Result
Error occured:

Host prototype with host name "{#VM.UUID}" already exists in discovery rule "Discover VMware VMs".

Screenshot attached.
Expected
Template names differs between versions so it is expected that old template has no affect to the new one. They shall act as two independent templates and don't conflict.