There is no problem with cloning templates, this is done by the command
qm clone 252 1003 --name 3
And then after coning, I wanted to change the ip
qm set 1003 --ipconfig0 ip=192.168.0.3/24,gw=192.168.0.1
See response
update VM 1003: -ipconfig0 ip=192.168.0.3/24,gw=192.168.0.1
I reboot VM 1003...