Return of banned users - how reliable is a v6 IP-address as a criteria?

I do not have many bans in my forum, just the usual troll a couple of times a year. Today, a new user registered and the spam protection went alert, telling me that the IP of this user would be identical to a troll I banned last year. It is an IP v6 address for the matter. Typically we have private users with dynamic IP adressess (v4) but there are some that log in from their workplace regularly. With dynamic v4 they are randomly reassigned with customers of the provider in thegeogrphic...

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