If you're working with tighter tolerances than the lookup option allows (like a real-time search) or insist on having it done in a single search, you could include the account creation events in your base search. Then use eventstats split by account to get your account creation info fields into the password reset events. The downside of this approach is that depending on the amount of events you're dealing with and how big the time window is, it could take a long time to run and maybe even hit time and resource limits.