I have a ton of network firewall rules that I am configuring. They are currently all IPv4 and allow certain ingress/egress flows for private IPv4 addresses.

I am trying to translate these private addresses to ULA’s in IPv6. However, I am not sure if I can make the like for like swap.

Is allowing ULA addresses the same as allowing private IPv4 addresses or is it riskier as it opens you up to the public internet as well (potentially)?