If you want to use FQDNs because both your ASAs have dynamic IP-addresses, then the answer is no. At least one ASA needs to have a fixed IP. And then it doest't matter if you use PSK or certificate-authentication. But the IPSec peer always has to be specified by the IP-address.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...