You can do the many-to-few (or one) NAT behavior with port rewrites in IPv6 if you want to, there are just few circumstances it makes any sense. FWIW the broad

You can do the many-to-few (or one) NAT behavior with port rewrites in IPv6 if you want to, there are just few circumstances it makes any sense. FWIW the broad IPv6 network-prefix NAT behavior ALSO EXISTS in IPv4, it's just less applicable.