actually, there is a BIG difference.
IPv4 needs port forwarding because of how NAT works (1 IP for the whole network and the router Translates between the public IPv4 and the local IPv4s inside the network.)
in IPv6 each Device has its own public IP (or even multiple of them), and therefore no "port forwarding" is needed, just a hole in all the firewalls the device is sitting behind (mainly the router), and I am totally able to do that.
Compare it with a ps4 sitting directly behind a modem without a router but just a firewall.
DualStack Lite basically means, you dont get your "own" IPv4, but you have a full public IPv6 subnet.
Normal Dualstack means, you have BOTH an IPv4 to use completely AND an IPv6 subnet.